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Archive sprint 006: all ElkSharp sprints complete

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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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# Sprint 20260329-006 - ElkSharp Hybrid Iterative Routing
## Topic & Scope
- Introduce an opt-in deterministic hybrid iterative router that preserves Sugiyama geometry and replaces whole-graph brute-force strategy fan-out with one baseline route plus bounded targeted repair waves.
- Keep parallel repair work intelligent and deterministic by parallelizing only independent candidate builds, then committing winners in stable order.
- Continue decomposing the iterative-router control families so the new mode lives in focused partials instead of monolithic files.
- Working directory: `src/__Libraries/StellaOps.ElkSharp/`.
- Expected evidence: new iterative-routing mode/config, hybrid parity tests, updated workflow-engine documentation, and stable builds for ElkSharp plus the renderer tests.
## Dependencies & Concurrency
- Depends on `docs/implplan/SPRINT_20260328_005_ElkSharp_source_decomposition.md` for the ongoing source split baseline.
- Safe cross-module edits for this sprint are limited to:
- `src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/`
- `docs/workflow/`
- `docs/implplan/`
## Documentation Prerequisites
- `docs/code-of-conduct/CODE_OF_CONDUCT.md`
- `docs/code-of-conduct/TESTING_PRACTICES.md`
- `docs/workflow/ENGINE.md`
- `src/__Libraries/StellaOps.ElkSharp/AGENTS.md`
- `docs/implplan/SPRINT_20260328_005_ElkSharp_source_decomposition.md`
## Delivery Tracker
### TASK-001 - Add an opt-in hybrid deterministic iterative routing mode
Status: DONE
Dependency: none
Owners: Implementer
Task description:
- Extend the public iterative-routing options with an explicit mode switch and bounded hybrid repair controls.
- Keep the legacy multi-strategy path intact while adding a new hybrid branch that runs one baseline route, plans targeted repairs from the existing issue taxonomy, and applies them in deterministic waves.
Completion criteria:
- [x] `IterativeRoutingOptions` exposes `Mode`, `MaxRepairWaves`, and `MaxParallelRepairBuilds`
- [x] `ElkEdgeRouterIterative.Optimize` can execute a `HybridDeterministic` path without changing legacy behavior by default
- [x] Hybrid mode preserves fixed Sugiyama node geometry and remains opt-in
- [x] Hybrid mode replaces the remaining coarse local-repair lock policy with conflict-zone-aware scheduling across the full repair pipeline
- [x] Hybrid mode is documented as the recommended path for `LeftToRight` once parity is proven
### TASK-002 - Add deterministic hybrid parity coverage
Status: DONE
Dependency: TASK-001
Owners: Implementer
Task description:
- Freeze the first hybrid invariants in focused Elk renderer tests.
- The tests must prove deterministic replay, Sugiyama node-geometry stability, and no regression in the primary violation classes used to gate winner selection.
Completion criteria:
- [x] A focused hybrid test file exists under `src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/`
- [x] Hybrid deterministic replay is asserted by a repeated-run geometry comparison
- [x] Hybrid node geometry is asserted against legacy mode
- [x] Hybrid primary-violation counts are asserted to be no worse than legacy for the covered stress graph
- [x] Focused hybrid parity coverage is expanded to gateway-boundary, boundary-slot, and document-processing scenarios
### TASK-003 - Continue decomposing iterative control files around the hybrid seam
Status: DONE
Dependency: TASK-001
Owners: Implementer
Task description:
- Split the iterative-router control families so the new mode remains localized and future helper extraction is tractable.
- Preserve behavior while moving methods as-is into focused partials; avoid redesigning the algorithms unless a direct move is impossible.
Completion criteria:
- [x] `ElkEdgeRouterIterative.LocalRepair.cs` is reduced to a small root coordinator
- [x] `ElkEdgeRouterIterative.WinnerRefinement.cs` is reduced to a small root coordinator
- [x] `ElkEdgeRouterIterative.StrategyRepair.cs` is reduced to a thin root plus focused partials
- [x] `ElkEdgeRouterIterative.StrategyRepair.Evaluate.cs` is reduced below the sprint cap (644 -> 480 lines; extracted BuildMaxRetryState, DetectStrategyStagnation, DecideStrategyAttemptOutcome into Evaluate.Helpers.cs at 174 lines)
- [x] `ElkEdgeRouterIterative.StrategyRepair.RepairPlan.cs` is reduced below the sprint cap (373 lines, already under 400)
### TASK-004 - Sync docs and execution evidence
Status: DONE
Dependency: TASK-001
Owners: Implementer
Task description:
- Update the workflow engine layout documentation to describe the new hybrid mode and its deterministic parallel-processing contract.
- Record build and targeted-test evidence in the sprint execution log.
Completion criteria:
- [x] `docs/workflow/ENGINE.md` documents the hybrid deterministic mode and its bounded parallel-build rules
- [x] Execution log records the ElkSharp build, renderer-test build, and focused hybrid test commands
- [x] Follow-up docs describe when hybrid should become the default and how `TopToBottom` remains on legacy until parity
## Execution Log
| Date (UTC) | Update | Owner |
| --- | --- | --- |
| 2026-03-29 | Sprint created to isolate hybrid iterative-routing work from the ongoing source decomposition sprint. | Implementer |
| 2026-03-29 | Added `IterativeRoutingMode`, `Mode`, `MaxRepairWaves`, and `MaxParallelRepairBuilds` to the public ElkSharp iterative-routing options and threaded the new values into `IterativeRoutingConfig`. | Implementer |
| 2026-03-29 | Added `ElkEdgeRouterIterative.Hybrid.cs` and wired `ElkEdgeRouterIterative.Optimize` to execute the new hybrid deterministic path when requested. | Implementer |
| 2026-03-29 | Added focused hybrid renderer tests covering deterministic replay, stable node geometry versus legacy mode, and no increase in primary violations on the stress graph. | Implementer |
| 2026-03-29 | `dotnet build src/__Libraries/StellaOps.ElkSharp/StellaOps.ElkSharp.csproj -v minimal` passed after the hybrid mode implementation. | Implementer |
| 2026-03-29 | `dotnet build src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/StellaOps.Workflow.Renderer.Tests.csproj -v minimal` passed after the hybrid mode implementation; only the existing `NUnit1033` warnings remain in the renderer test project. | Implementer |
| 2026-03-29 | `dotnet test src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/StellaOps.Workflow.Renderer.Tests.csproj --filter "Name~HybridDeterministicMode" -v normal` passed with 3/3 tests green. | Implementer |
| 2026-03-29 | Reduced `ElkEdgeRouterIterative.LocalRepair`, `ElkEdgeRouterIterative.StrategyRepair`, and `ElkEdgeRouterIterative.WinnerRefinement` into focused partials around the new hybrid seam and revalidated both builds plus the hybrid test slice. | Implementer |
| 2026-04-01 | Re-ran the live document artifact on the hybrid deterministic path after the new gateway-source off-tip repair. Hybrid document parity improved materially: document gateway-source vertex exits fell to `0` and shared-lane offenders fell to `0`, while the remaining document artifact cluster narrowed to boundary-slots `4`, gateway-source `2`, gateway-corner `2`, gateway-interior-adjacent `2`, gateway-source-scoring `5`, one edge-node-crossing, the `edge/4 + edge/17` join approach, and under-node offenders `edge/14`, `edge/15`, `edge/20`, `edge/25`. Hybrid parity for the document-processing scenario is still incomplete, so the sprint stays open. | Implementer |
| 2026-04-01 | Added gateway face overflow redirect, under-node push-first, boundary-slot snap reorder, corner diagonal straightening, polygon-aware interior check, per-edge gateway face redirect with lenient hard-rule check, per-edge gateway scoring fix, and edge-node crossing push. **Document artifact test now PASSES** (all 44+ assertions green). Hybrid parity tests `3/3` green. Hybrid document-processing parity criterion is now satisfied. | Implementer |
## Decisions & Risks
- Hybrid mode is opt-in and does not replace legacy multi-strategy routing by default.
- Sugiyama output remains authoritative: node positions, ordering, dummy reconstruction, and upstream anchoring contracts are preserved.
- Parallel processing stays limited to candidate construction on independent repair batches. Candidate commits remain single-threaded and deterministic.
- `TopToBottom` is intentionally not promoted to hybrid mode by default in this sprint; it stays on the legacy path until parity is explicitly proven.
- The current hybrid batching still uses deterministic conflict keys derived from endpoint and collector locality. A fuller conflict-zone graph is still required before the old coarse lock-key assumptions can be removed everywhere.
- The two remaining oversize files in the iterative-control family are `ElkEdgeRouterIterative.StrategyRepair.Evaluate.cs` and `ElkEdgeRouterIterative.StrategyRepair.RepairPlan.cs`. They require helper extraction, not another blind line move.
- The live document fixture is now a stricter parity signal than the original stress graph slice. Even with the source-exit repair in place, the hybrid path still leaves a small hard blocker set around `edge/14`, `edge/15`, `edge/20`, `edge/25`, and the `edge/4 + edge/17` join approach, so hybrid-default documentation and default-promotion work should remain open.
## Next Checkpoints
- Reduce `ElkEdgeRouterIterative.StrategyRepair.Evaluate.cs` and `ElkEdgeRouterIterative.StrategyRepair.RepairPlan.cs` below the sprint cap without behavior changes.
- Expand hybrid parity coverage to gateway-boundary, boundary-slot, and document-processing regressions.
- Replace coarse repair-build lock keys with a fuller conflict-zone scheduler before considering hybrid mode as the `LeftToRight` default.