Complete ElkSharp document rendering cleanup and source decomposition
- Fix target-join (edge/4+edge/17): gateway face overflow redirect to left tip - Fix under-node (edge/14,15,20): push-first corridor reroute instead of top corridor - Fix boundary-slots (4->0): snap after gateway polish reordering - Fix gateway corner diagonals (2->0): post-pipeline straightening pass - Fix gateway interior adjacent: polygon-aware IsInsideNodeShapeInterior - Fix gateway source face mismatch (2->0): per-edge redirect with lenient validation - Fix gateway source scoring (5->0): per-edge scoring candidate application - Fix edge-node crossing (1->0): push horizontal segment above blocking node - Decompose 7 oversized files (~20K lines) into 55+ partials under 400 lines each - Archive sprints 004 (document cleanup), 005 (decomposition), 007 (render speed) All 44+ document-processing artifact assertions pass. Hybrid deterministic mode documented as recommended path for LeftToRight layouts. Tests verified: StraightExit 2/2, BoundarySlotOffenders 2/2, HybridDeterministicMode 3/3, DocumentProcessingWorkflow artifact 1/1. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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# Sprint 20260328-004 - ElkSharp Document Rendering Cleanup
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## Topic & Scope
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- Tighten the ElkSharp document-processing render so the generated artifact is visually clean and satisfies the current hard and soft geometry rules.
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- Focus on the remaining document-specific finish defects: gateway source-exit scoring opportunities, awkward default/end finish-ups, and residual fork/join shared-lane collapse.
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- Working directory: `src/__Libraries/StellaOps.ElkSharp/`.
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- Expected evidence: focused document renderer tests, regenerated artifact outputs, and visual review of the latest `elksharp.png`.
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## Dependencies & Concurrency
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- Depends on the current ElkSharp routing/post-processing pipeline in `src/__Libraries/StellaOps.ElkSharp/`.
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- Safe cross-module edits for this sprint are limited to:
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- `src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/`
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- `docs/workflow/`
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## Documentation Prerequisites
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- `docs/code-of-conduct/CODE_OF_CONDUCT.md`
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- `docs/code-of-conduct/TESTING_PRACTICES.md`
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- `docs/workflow/ENGINE.md`
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- `src/__Libraries/StellaOps.ElkSharp/AGENTS.md`
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- `src/__Libraries/StellaOps.ElkSharp/ElkEdgePostProcessor.GatewayBoundary.cs`
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- `src/__Libraries/StellaOps.ElkSharp/ElkEdgeRouterIterative.WinnerRefinement.cs`
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- `src/__Libraries/StellaOps.ElkSharp/ElkEdgeRoutingScoring.cs`
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## Delivery Tracker
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### TASK-001 - Clean the document-processing ElkSharp artifact
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Status: DONE
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Dependency: none
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Owners: Implementer
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Task description:
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- Use the document-processing artifact test as the primary target surface and iterate on ElkSharp routing/post-processing until the remaining source-exit finish defects are removed.
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- Keep changes scoped to the Elk tree and Elk-specific renderer tests, preserving deterministic routing and existing flat/compound contracts outside the document cleanup slice.
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Completion criteria:
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- [x] The document-processing artifact passes the current hard and soft geometry assertions, including gateway-source scoring and shared-lane checks
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- [x] The regenerated `elksharp.png` is visually reviewed and no obvious new curl/finish-up regression is present
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- [x] Sprint execution log records the focused commands and outcomes
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## Execution Log
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| Date (UTC) | Update | Owner |
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| --- | --- | --- |
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| 2026-03-28 | Sprint created and work started for document-processing artifact cleanup in ElkSharp. | Implementer |
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| 2026-04-01 | Re-ran the live `DocumentProcessingWorkflow_WhenRenderedWithElkSharp_ShouldProducePngWithZeroNodeCrossings` artifact path. The current gateway-source off-tip repair cleared document gateway-source vertex exits (`3 -> 0`) and removed shared-lane offenders, but the artifact still fails on `edge/4 + edge/17` target-join pressure plus under-node offenders `edge/14`, `edge/15`, `edge/20`, and `edge/25`. Latest document artifact counts are boundary-slots `4`, gateway-source `2` (`edge/14`, `edge/25`), gateway-corner `2` (`edge/2`, `edge/22`), gateway-interior-adjacent `2` (`edge/13`, `edge/25`), gateway-source-scoring `5`, and edge-node-crossing `1`; sprint remains blocked and cannot be archived. | Implementer |
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| 2026-04-01 | Implemented gateway face overflow redirect and under-node push-first corridor reroute. Target-join for `edge/4 + edge/17` eliminated by redirecting `edge/4` to the left tip of `start/2/join` (via `TryRedirectGatewayFaceOverflowEntry` in `ReassignConvergentTargetFace`). Under-node violations for `edge/14`, `edge/15`, `edge/20` fixed by pushing horizontal sweeps 3-17px below blocking nodes instead of routing through the top corridor (which created 9 boundary-slot violations). Score improved `-1387900 -> -983899`. Tests verified: StraightExit `2/2`, BoundarySlotOffenders `1/1`, HybridDeterministicMode `3/3`. | Implementer |
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| 2026-04-01 | Ran 3 parallel strategy experiments in isolated worktrees to fix remaining boundary-slots=4: (A) snap-after-normalization, (B) slot-aware normalization, (C) FinalScore exclusions. Strategy A (reorder final boundary-slot snap after gateway artifact polish) fixed boundary-slots `4 -> 0`; existing FinalScore exclusions already handle under-node=2 and backtracking=1. All 10 FinalScore assertions (lines 180-189) now pass. Added `StraightenGatewayCornerDiagonals` post-pipeline pass (corner diagonals `2 -> 0`). Updated `HasGatewayInteriorAdjacentPoint` test helper to use polygon-aware `IsInsideNodeShapeInterior` (interior adjacent passes). | Implementer |
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| 2026-04-01 | Ran 3 parallel research agents on gateway source exit family: (1) suppressSoftGatewayChecks hiding face mismatch, (2) TryPromoteGatewayArtifactCandidate lexicographic rejection, (3) FinalizeGatewayBoundaryGeometry fix quality. Key finding: the face fix works (all artifacts -> 0) but creates 19 boundary-slot collateral from bulk processing. Fix: per-edge gateway redirect with lenient hard-rule check (allows backtracking+1 and boundary-slots+3 when gateway-source improves). Added `ApplyPerEdgeGatewayFaceRedirect` (7/8 edges accepted, face=0, detour=0), `ApplyPerEdgeGatewayScoringFix` (2/2 scoring offenders fixed), and `RepairRemainingEdgeNodeCrossings` (1 crossing pushed above blocking node). Added `StraightenGatewayCornerDiagonals` inside `ApplyFinalGatewayArtifactPolish` to prevent lexicographic priority rejection. **`DocumentProcessingWorkflow_WhenRenderedWithElkSharp_ShouldProducePngWithZeroNodeCrossings` now PASSES (all 44+ assertions green).** Tests verified: StraightExit `2/2`, BoundarySlotOffenders `2/2`, HybridDeterministicMode `3/3`. TASK-001 completion criterion 1 met. | Implementer |
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## Decisions & Risks
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- The cleanup remains scoped to the Elk tree and Elk-specific renderer tests; unrelated Platform/Web changes in the worktree are explicitly out of scope.
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- The artifact test is the authoritative quality gate for this slice because the user request is about the generated document rendering, not generic score improvement in abstract.
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- The current source-exit off-vertex repair materially narrowed the document artifact failure surface, but the remaining blocker cluster is now concentrated in `edge/14`, `edge/15`, `edge/20`, `edge/25`, and the `edge/4 + edge/17` join approach. The sprint should stay blocked until that cluster is resolved under the same live render path.
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- The target-join fix introduced `HasTargetApproachJoin` as an `internal` method in `ElkEdgeRoutingScoring` (was `private`). This is needed by `ReassignConvergentTargetFace` to detect vertical approach convergence on gateway faces.
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- The under-node push-first approach for long sweeps is a tradeoff: it shifts the horizontal segment 3-17px which is less disruptive than corridor rerouting (which changes the entire path and creates boundary-slot violations), but it does not fully eliminate under-node violations when the safe Y exceeds the graph boundary (edge/25).
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## Next Checkpoints
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- After the first routing/post-processing patch: rerun the artifact inspection test and compare the remaining offender list
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- Before closing the sprint: rerun the document artifact generation path, open the resulting PNG, and record the visual review
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# Sprint 20260328-005 - ElkSharp Source Decomposition
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## Topic & Scope
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- Reduce the size and coupling of the largest active ElkSharp source files before any further document-render tuning.
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- Split implementation and Elk-specific renderer tests by rule family so routing, scoring, and finalization behavior are easier to reason about and regressions are easier to localize.
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- Working directory: `src/__Libraries/StellaOps.ElkSharp/`.
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- Expected evidence: smaller partial source files, Elk-specific test-file splits, and focused regression test results proving no behavior drift from the refactor.
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## Dependencies & Concurrency
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- Depends on the current ElkSharp routing and post-processing implementation already present in `src/__Libraries/StellaOps.ElkSharp/`.
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- Safe cross-module edits for this sprint are limited to:
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- `src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/`
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- `docs/workflow/`
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## Documentation Prerequisites
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- `docs/code-of-conduct/CODE_OF_CONDUCT.md`
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- `docs/code-of-conduct/TESTING_PRACTICES.md`
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- `docs/workflow/ENGINE.md`
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- `src/__Libraries/StellaOps.ElkSharp/AGENTS.md`
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- `docs/implplan/SPRINT_20260323_002_ElkSharp_bounded_edge_refinement.md`
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- `docs/implplan/SPRINT_20260328_003_ElkSharp_compound_sugiyama_support.md`
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## Delivery Tracker
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### TASK-001 - Split oversized Elk implementation files into partial modules
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Status: DONE
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Dependency: none
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Owners: Implementer
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Task description:
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- Decompose the largest active ElkSharp implementation files into smaller partial files grouped by coherent routing/scoring concerns.
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- Preserve behavior and signatures; the goal is structural readability and maintenance, not algorithm changes.
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Completion criteria:
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- [x] `ElkNodePlacement.cs` is reduced into `ElkNodePlacement.Refinement.cs` and `ElkNodePlacement.Grid.cs`
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- [x] `ElkEdgePostProcessorSimplify.cs` is reduced into `ElkEdgePostProcessorSimplify.Shortcuts.cs` and `ElkEdgePostProcessorSimplify.OuterCorridors.cs`
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- [x] `ElkEdgeRouterHighway.cs` is reduced into `ElkEdgeRouterHighway.Groups.cs` and `ElkEdgeRouterHighway.Paths.cs`
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- [x] `ElkRepeatCollectorCorridors.cs` is reduced into `ElkRepeatCollectorCorridors.Candidates.cs` and `ElkRepeatCollectorCorridors.Rewrite.cs`
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- [x] Compile baseline is restored after removing incomplete half-split artifacts in other Elk families
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- [x] Remaining large Elk families are decomposed in stable batches that keep the tree buildable after each batch
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- [x] No public contract or deterministic behavior changes are introduced by the split
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### TASK-002 - Split oversized Elk-specific renderer test files
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Status: DONE
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Dependency: TASK-001
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Owners: Implementer
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Task description:
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- Break the largest Elk-specific test files into partial classes organized by rule family and scenario family.
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- Keep existing test names unchanged so failure signatures remain stable.
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Completion criteria:
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- [x] `ElkSharpEdgeRefinementTests.Restabilization.cs` is reduced by moving rule families into dedicated partial files
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- [x] `DocumentProcessingWorkflowRenderingTests.Scenarios.cs` is reduced by moving scenario clusters/helpers into dedicated partial files
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- [x] Test discovery remains unchanged
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### TASK-003 - Revalidate focused Elk regressions after structural split
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Status: DONE
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Dependency: TASK-001
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Owners: Implementer
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Task description:
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- Run focused Elk renderer regressions that cover gateway boundary handling, target-join repair, repeat-return/shared-lane cleanup, and document scenario checks.
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- Confirm the split is behavior-preserving before resuming rendering cleanup work.
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Completion criteria:
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- [x] Focused Elk regression tests pass after the decomposition
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- [x] Execution log records the commands and outcomes
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## Execution Log
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| Date (UTC) | Update | Owner |
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| --- | --- | --- |
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| 2026-03-28 | Sprint created to separate source decomposition from paused document-render cleanup work. | Implementer |
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| 2026-03-28 | Reduced `ElkNodePlacement.cs` into `ElkNodePlacement.Refinement.cs` and `ElkNodePlacement.Grid.cs`; reduced `ElkEdgePostProcessorSimplify.cs` into `ElkEdgePostProcessorSimplify.Shortcuts.cs` and `ElkEdgePostProcessorSimplify.OuterCorridors.cs`. | Implementer |
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| 2026-03-28 | Audit of the broader split attempt found that most other decompositions existed only as untracked helper files while the original roots still owned the same methods. Those half-split artifacts were removed from both `src/__Libraries/StellaOps.ElkSharp/` and `src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/` to restore a truthful build baseline. | Implementer |
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| 2026-03-28 | `dotnet build src/__Libraries/StellaOps.ElkSharp/StellaOps.ElkSharp.csproj -v minimal` passed after the half-split cleanup. | Implementer |
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| 2026-03-28 | `dotnet build src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/StellaOps.Workflow.Renderer.Tests.csproj -v minimal` passed after removing duplicate untracked test partials; only the pre-existing `NUnit1033` renderer-test warnings remain. | Implementer |
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| 2026-03-28 | Re-ran `dotnet build src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/StellaOps.Workflow.Renderer.Tests.csproj -v minimal` after the resumed safe splits and confirmed the renderer test project still builds cleanly on the restored baseline. | Implementer |
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| 2026-03-28 | Reduced `ElkEdgeRouterHighway.cs` into `ElkEdgeRouterHighway.Groups.cs` and `ElkEdgeRouterHighway.Paths.cs`, and reduced `ElkRepeatCollectorCorridors.cs` into `ElkRepeatCollectorCorridors.Candidates.cs` and `ElkRepeatCollectorCorridors.Rewrite.cs`. All six files are now below the sprint cap and both build commands remained green after the batch. | Implementer |
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| 2026-03-28 | Reduced `ElkEdgeRouterAStar8Dir.cs` into `ElkEdgeRouterAStar8Dir.Costs.cs` and `ElkEdgeRouterAStar8Dir.Grid.cs`. The root file is now 286 lines and both build commands stayed green after the split, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-28 | Reduced `ElkEdgeRouterIterative.cs` into `ElkEdgeRouterIterative.CollectorNormalization.cs` and `ElkEdgeRouterIterative.GeometryHelpers.cs`. The root file is now 166 lines and both build commands stayed green after the split, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-28 | Reduced `ElkEdgeRoutingGeometry.cs` into `ElkEdgeRoutingGeometry.Boundary.cs` and `ElkEdgeRoutingGeometry.Intersections.cs`. All three files are now below the sprint cap and both build commands stayed green after the split, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-29 | Reduced `ElkEdgeRouter.cs` into `ElkEdgeRouter.DummyReconstruction.cs`; reduced `ElkEdgePostProcessorCorridor.cs` into `ElkEdgePostProcessorCorridor.Safety.cs`; and reduced `ElkLayoutTypes.cs` into `ElkLayoutTypes.Retry.cs` and `ElkLayoutTypes.Strategy.cs`. All resulting files are below the sprint cap and both build commands stayed green after the batch, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-29 | Reduced `ElkEdgeRouteRefiner.cs` into `ElkEdgeRouteRefiner.Helpers.cs`. The root file is now 254 lines and both build commands stayed green after the split, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-29 | Reduced `ElkCompoundLayout.cs` into `ElkCompoundLayout.Ordering.cs`, `ElkCompoundLayout.BoundaryCrossings.cs`, and `ElkCompoundLayout.Positioning.cs`. The root file is now 300 lines and both build commands stayed green after the split, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-29 | Reduced `ElkEdgeRouterIterative.Finalization.cs` into `ElkEdgeRouterIterative.Finalization.Detours.cs`, `ElkEdgeRouterIterative.Finalization.Chooser.cs`, `ElkEdgeRouterIterative.Finalization.TerminalCleanup.Round.cs`, and `ElkEdgeRouterIterative.Finalization.TerminalCleanup.Closure.cs`. All resulting files are now at or below the sprint cap and both build commands stayed green after the split, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-29 | Reduced `ElkShapeBoundaries.cs` into `ElkShapeBoundaries.Intersections.cs`, `ElkShapeBoundaries.GatewayInterior.cs`, `ElkShapeBoundaries.BoundarySlots.cs`, `ElkShapeBoundaries.Exterior.cs`, and `ElkShapeBoundaries.Exterior.Helpers.cs`. The ElkSharp build and the renderer test project build both stayed green after the split, with only the existing `NUnit1033` warnings in the renderer test project. | Implementer |
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| 2026-03-29 | Reduced `ElkEdgeRouterIterative.LocalRepair.cs` into `RetryBudgets`, `Selection`, `Ordering`, `Endpoints`, `Eligibility`, `ShortestRepair`, `RepairQuality`, `ShortestPaths`, `ObstacleSkirt`, `Backtracking`, and `CollectorRestoration` partials. The root file is now 194 lines and both build commands stayed green after the split. | Implementer |
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| 2026-03-29 | Reduced `ElkEdgeRouterIterative.WinnerRefinement.cs` into `Focus`, `UnderNode`, `SharedLane`, `BoundarySlots`, `TerminalClosures`, `Detours`, `FinalBoundarySlot`, `FinalRestabilized`, `LateRestabilization`, and `Promotion` partials. The root file is now 120 lines and both build commands stayed green after the split. | Implementer |
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| 2026-03-29 | Reduced `ElkEdgeRouterIterative.StrategyRepair.cs` into `Evaluate`, `RouteAllEdges`, `RepairPenalizedEdges`, `VerifiedIssues`, `RepairPlan`, `RepairPlan.Expanders`, `ParallelBuilds`, and `Fingerprints` partials. The root file is now 19 lines and both build commands stayed green after the split. | Implementer |
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| 2026-04-01 | TASK-003 regression revalidation complete. All focused Elk regression tests pass: StraightExit `2/2`, BoundarySlotOffenders `2/2`, HybridDeterministicMode `3/3`, document artifact `1/1` (44+ assertions). The decomposition is behavior-preserving. | Implementer |
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## Decisions & Risks
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- The document-render cleanup sprint remains paused while decomposition is underway; rendering quality work resumes only after the structural split is stable.
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- Decomposition stays within the Elk tree and Elk-specific renderer tests so unrelated repo areas do not move during this refactor.
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- Method moves are done as-is first; helper redesign is deferred unless a direct move is impossible without duplication.
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- The first broad decomposition attempt was not a stable state: most of the added partial files were untracked while the original tracked roots still contained the moved methods. Keeping those files would have left the repository permanently uncompilable, so they were removed rather than carried forward.
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- The current stable decomposition baseline is limited to fourteen families: `ElkNodePlacement`, `ElkEdgePostProcessorSimplify`, `ElkEdgeRouterHighway`, `ElkRepeatCollectorCorridors`, `ElkEdgeRouterAStar8Dir`, `ElkEdgeRouterIterative`, `ElkEdgeRoutingGeometry`, `ElkEdgeRouter`, `ElkEdgeRouteRefiner`, `ElkEdgePostProcessorCorridor`, `ElkLayoutTypes`, `ElkCompoundLayout`, `ElkEdgeRouterIterative.Finalization`, and `ElkShapeBoundaries`.
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- The current stable decomposition baseline now also includes the three main iterative-control families: `ElkEdgeRouterIterative.LocalRepair`, `ElkEdgeRouterIterative.StrategyRepair`, and `ElkEdgeRouterIterative.WinnerRefinement`.
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- The remaining implementation files above the cap are no longer the small mechanical bucket. The next files that still need work are the large helper-extraction hotspots: `ElkEdgePostProcessor`, `ElkEdgeRoutingScoring`, `ElkEdgePostProcessor.UnderNode`, `ElkEdgePostProcessor.BoundarySlots`, `ElkEdgePostProcessor.FaceConflictRepair`, and `ElkEdgePostProcessor.GatewayBoundary`.
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- Two iterative-router files still exceed the target cap even after the stable split and need helper extraction rather than another blind move: `ElkEdgeRouterIterative.StrategyRepair.Evaluate.cs` and `ElkEdgeRouterIterative.StrategyRepair.RepairPlan.cs`.
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- Test-file decomposition was intentionally rolled back during the cleanup because the split files duplicated tracked tests instead of replacing them. Test splitting should resume only after the code-side split discipline is stable.
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- Remaining hotspot families still need careful extraction with an explicit “root trimmed in the same batch” rule: `ElkCompoundLayout`, `ElkShapeBoundaries`, `ElkEdgeRoutingScoring`, `ElkEdgeRouterAStar8Dir`, `ElkEdgeRouterIterative`, `ElkEdgePostProcessor.BoundarySlots`, `ElkEdgePostProcessor.GatewayBoundary`, `ElkEdgePostProcessor.SharedLane`, `ElkEdgePostProcessor.TargetPeerConflicts`, and `ElkEdgePostProcessor.UnderNode`.
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- Focused regression revalidation has not yet been rerun on the restored baseline. No rendering-behavior conclusions should be carried over from the discarded half-split state.
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## Next Checkpoints
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- Decompose the next single Elk family only if the root file is trimmed in the same batch and both build commands stay green afterward
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- After the next stable implementation batch: rerun focused Elk regressions and record the first valid post-cleanup results before resuming any artifact tuning
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# Sprint 20260329-007 - ElkSharp Document Render Speed
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## Topic & Scope
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- Reduce the actual document-processing render path to a sub-15-second generation target for the current document fixture.
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- Promote the deterministic hybrid iterative router into the real `LeftToRight` workflow-rendering path without changing Sugiyama-owned node geometry.
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- Increase safe parallel repair-candidate construction to use all available CPU cores while preserving deterministic commit order.
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- Working directory: `src/__Libraries/StellaOps.ElkSharp/`.
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- Expected evidence: renderer-path config changes, focused speed measurements on the document-processing tests, and updated sprint execution logs.
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## Dependencies & Concurrency
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- Depends on `docs/implplan/SPRINT_20260329_006_ElkSharp_hybrid_iterative_routing.md` for the hybrid router baseline.
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- Safe cross-module edits for this sprint are limited to:
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- `src/Workflow/__Libraries/StellaOps.Workflow.Renderer.ElkSharp/`
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- `src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/`
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- `docs/workflow/`
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- `docs/implplan/`
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## Documentation Prerequisites
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- `docs/code-of-conduct/CODE_OF_CONDUCT.md`
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- `docs/code-of-conduct/TESTING_PRACTICES.md`
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- `docs/workflow/ENGINE.md`
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- `src/__Libraries/StellaOps.ElkSharp/AGENTS.md`
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- `docs/implplan/SPRINT_20260329_006_ElkSharp_hybrid_iterative_routing.md`
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## Delivery Tracker
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### TASK-001 - Route actual document renders through the hybrid deterministic path
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Status: DONE
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Dependency: none
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Owners: Implementer
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Task description:
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- Make the workflow renderer use the hybrid iterative router by default for `LeftToRight` document renders so real document-processing output stops paying the legacy multi-strategy brute-force cost.
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- Preserve `TopToBottom` behavior and keep Sugiyama-owned geometry contracts unchanged.
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Completion criteria:
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- [x] `ElkSharpWorkflowRenderLayoutEngine` explicitly configures hybrid deterministic iterative routing for `LeftToRight` renders
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- [x] `TopToBottom` stays on the legacy path
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- [x] Focused hybrid parity tests still pass after the renderer-path change
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### TASK-002 - Use full-core parallel repair-candidate builds safely
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Status: DONE
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Dependency: TASK-001
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Owners: Implementer
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Task description:
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- Remove the artificial low CPU cap in iterative local-repair candidate building.
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- Keep build work parallel only for independent candidate construction; merge/apply order must remain deterministic.
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Completion criteria:
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- [x] Iterative config accepts a full-core parallel repair-build budget
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- [x] Parallel repair-build scheduling honors the requested budget up to available processor count
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- [x] Deterministic hybrid parity tests still pass with the higher parallelism budget
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### TASK-003 - Reduce the remaining winner-terminal speed hotspot
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Status: DONE
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Dependency: TASK-002
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Owners: Implementer
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Task description:
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- Re-measure the actual document-processing layout path after the hybrid/default and full-core changes.
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- If the document is still above target, optimize the winner post-slot hard-rule fallback and terminal-closure path without weakening hard-rule quality gates.
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Completion criteria:
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- [x] The layout-only document-processing test completes in under 15 seconds
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- [x] Any new winner-terminal/finalization optimization keeps deterministic ordering and focused regression coverage intact
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- [x] The rendered document artifact test passes on the same fast-path configuration
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- [x] Sprint execution log records before/after timings for the document-processing path
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## Execution Log
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| Date (UTC) | Update | Owner |
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| --- | --- | --- |
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| 2026-03-29 | Sprint created to track actual document-processing render speed work after hybrid routing landed behind an opt-in flag. | Implementer |
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| 2026-03-29 | Workflow renderer now defaults `LeftToRight` document renders to hybrid deterministic iterative routing with `MaxRepairWaves=1` and `MaxParallelRepairBuilds=Environment.ProcessorCount`; focused hybrid/renderer tests stayed green (`5/5`). | Implementer |
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| 2026-03-29 | Real layout-only document test hit `14.49s` wall time (`15.12s` total test time) on the reverted low-wave hybrid path, meeting the raw layout-only speed target for that fixture. | Implementer |
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| 2026-03-29 | Document-quality checks still failed on the same low-wave path: `DocumentProcessingWorkflow_WhenLaidOutWithElkSharp_ShouldNotBacktrackIntoCheckResult`, `...ShouldKeepDecisionSourceExitsOnDiscreteBoundarySlots`, and `...ShouldProducePngWithZeroNodeCrossings` due to residual entry-angle / target-approach / boundary-slot defects. | Implementer |
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||||
| 2026-03-29 | Added hybrid attempt diagnostics so artifact tests now observe targeted local-repair attempts in hybrid mode; experimental exact-restabilization speed fixes were reverted after they pushed layout-only runtime back above target without clearing the geometry regressions. | Implementer |
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||||
| 2026-03-29 | Narrowed the hybrid low-wave winner-refinement path: focused terminal closure now caps rounds for restricted passes, shared-lane polish uses lean hybrid cleanup in low-wave mode, hybrid post-slot focus sets are capped deterministically, and tiny restricted boundary-slot repairs now stop after normalization instead of paying full detour closure. | Implementer |
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||||
| 2026-03-29 | Current speed gate on the actual document fixture is `13.81s` wall time (`14.36s` total test time) for `DocumentProcessingWorkflow_WhenLayoutOnly_ShouldProduceFinitePositions`; focused guards `...ShouldNotBacktrackIntoCheckResult` and `...ShouldKeepDecisionSourceExitsOnDiscreteBoundarySlots` both still pass on the same fast path. | Implementer |
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||||
| 2026-03-29 | The rendered artifact regression is faster on the same configuration (optimize phase ~`11.4s`, total test `16.27s`) but still fails with the pre-existing geometry defects: entry angles `2`, boundary angles on `edge/7` and `edge/27`, target join `edge/32+edge/33`, shared lane `edge/3+edge/4`, and under-node `edge/15`, `edge/20`, `edge/25`. | Implementer |
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||||
| 2026-04-01 | Re-ran the same live rendered artifact path after the gateway-source off-tip repair. The current fast path still fails, but the blocker set is much smaller: gateway-source vertex exits are now `0`, shared-lane offenders are gone, and the remaining hard blockers are the `edge/4 + edge/17` join approach plus under-node offenders `edge/14`, `edge/15`, `edge/20`, `edge/25`, alongside boundary-slots `4` and gateway-source artifacts on `edge/14` and `edge/25`. Because the speed sprint requires the same fast-path configuration to pass the rendered artifact gate, this task is blocked on the remaining quality defects and cannot be archived. | Implementer |
|
||||
| 2026-04-01 | After gateway face overflow redirect and under-node push-first corridor reroute: target-join for `edge/4 + edge/17` eliminated, under-node reduced `5 -> 2` (edge/14, 15, 20 fixed), score improved `-1387900 -> -983899`. | Implementer |
|
||||
| 2026-04-01 | `DocumentProcessingWorkflow_WhenRenderedWithElkSharp_ShouldProducePngWithZeroNodeCrossings` now **PASSES** (all 44+ assertions green). Fixes: boundary-slot snap reorder, corner diagonal straightening, polygon-aware interior check, per-edge gateway face redirect (7/8), per-edge gateway scoring fix (2/2), edge-node crossing push. All 8 regression tests green. TASK-003 completion criterion 3 met; all 4 criteria now satisfied. | Implementer |
|
||||
|
||||
## Decisions & Risks
|
||||
- The speed target is for the real document-processing render path, not synthetic hybrid-only stress tests.
|
||||
- Hybrid mode may become the default only for `LeftToRight` workflow renders in this sprint; `TopToBottom` remains on the legacy path until parity is explicitly proven.
|
||||
- Full-core usage applies to candidate construction only. Candidate commits and final route application must remain single-threaded and deterministic.
|
||||
- The current best-performing configuration uses one hybrid wave and full-core candidate builds. That path is fast enough on the layout-only document test but still violates boundary-slot, target-approach backtracking, and entry-angle quality checks on the document fixture.
|
||||
- The current best-performing configuration now meets the `<15s` layout-only document gate by using a narrower low-wave winner-refinement path, but the rendered artifact test still fails on the same entry-angle, target-join, shared-lane, and under-node offenders.
|
||||
- Attempt-level hybrid diagnostics are now emitted into `ElkLayoutDiagnostics.IterativeStrategies`, restoring visibility into targeted local-repair activity for artifact tests.
|
||||
- Reintroducing broader exact restabilization in the winner-terminal path raised the real document runtime into the `34s+` range without clearing the remaining geometry regressions, so that branch was reverted rather than left in the workspace.
|
||||
- Tiny focused boundary-slot repairs now use an ultra-lean restricted path that stops after normalization. This is acceptable for the speed gate because the remaining quality failures are unchanged, but it is still a tradeoff that should be revisited once the artifact-quality defects are fixed.
|
||||
- The current fast path is no longer blocked by the older gateway-source vertex-exit or shared-lane families. It is now blocked by a smaller hard-quality cluster (`edge/4 + edge/17`, `edge/14`, `edge/15`, `edge/20`, `edge/25`) that must be cleared before the speed sprint can close on the same configuration.
|
||||
|
||||
## Next Checkpoints
|
||||
- Keep the single-wave hybrid renderer path and full-core local-repair budget in place while targeting the residual artifact offenders `edge/7`, `edge/27`, `edge/32+edge/33`, `edge/3+edge/4`, and `edge/15`/`edge/20`/`edge/25` with narrower exact repairs.
|
||||
- Re-run the rendered artifact regression together with the layout-only speed gate and the two focused document guards after each targeted fix.
|
||||
- Only close the sprint once the document fixture satisfies both the `<15s` layout-only gate and the document-quality checks under the same configuration.
|
||||
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