Implement missing backend endpoints for release orchestration

TASK-002: 11 deployment monitoring endpoints in JobEngine
  (list, get, logs, events, metrics, pause/resume/cancel/rollback/retry)
TASK-003: 6 evidence management endpoints in JobEngine
  (list, get, verify, export, raw, timeline)
TASK-005: 3 release dashboard endpoints in JobEngine
  (dashboard summary, approve/reject promotion)
TASK-006: 2 registry image search endpoints in Scanner
  (search with 9 mock images, digests lookup)

All endpoints return seed/mock data for testing. Auth policies
match existing patterns. Dual route registration on both
/api/ and /api/v1/ prefixes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/implplan/SPRINT_20260323_002_ElkSharp_bounded_edge_refinement.md

@@ -0,0 +1,75 @@
+# Sprint 20260323-002 - ElkSharp Bounded Edge Refinement
+
+## Topic & Scope
+- Add a bounded deterministic edge-refinement stage to ElkSharp without replacing the existing channel and dummy-edge routing model.
+- Preserve orthogonal output, backward corridor behavior, sink corridor behavior, and target anchor heuristics.
+- Working directory: `src/__Libraries/StellaOps.ElkSharp/`
+- Expected evidence: targeted renderer tests, direct geometry assertions, and workflow docs updated for the new layout option.
+
+## Dependencies & Concurrency
+- Depends on the current ElkSharp routing pipeline in `src/__Libraries/StellaOps.ElkSharp/`.
+- Safe cross-module edits for this sprint are limited to:
+  - `src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/`
+  - `docs/workflow/`
+
+## 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/ElkSharpLayeredLayoutEngine.cs`
+- `src/__Libraries/StellaOps.ElkSharp/ElkEdgeRouter.cs`
+- `src/__Libraries/StellaOps.ElkSharp/ElkEdgePostProcessor.cs`
+
+## Delivery Tracker
+
+### TASK-001 - Add module-local ElkSharp guidance and option scaffolding
+Status: DONE
+Dependency: none
+Owners: Implementer
+Task description:
+Create a module-local `AGENTS.md` for ElkSharp and extend the layout option model with bounded refinement settings that default safely and deterministically.
+
+Completion criteria:
+- [x] `src/__Libraries/StellaOps.ElkSharp/AGENTS.md` exists with local routing rules
+- [x] `ElkLayoutOptions` exposes bounded refinement options without changing workflow request contracts
+
+### TASK-002 - Implement bounded orthogonal edge refinement
+Status: DONE
+Dependency: TASK-001
+Owners: Implementer
+Task description:
+Add an internal refinement stage that scores routed output, detects crossing-prone edges, and tries a small fixed set of orthogonal reroute strategies while preserving corridor and anchor semantics.
+
+Completion criteria:
+- [x] Refinement is deterministic and bounded by explicit pass and trial limits
+- [x] Refinement runs only for `LeftToRight` and preserves existing corridor and port-sensitive edges
+- [x] Existing simplify and tighten passes still run after refinement
+
+### TASK-003 - Add regression tests and docs
+Status: DONE
+Dependency: TASK-002
+Owners: Implementer
+Task description:
+Add regression tests covering deterministic output and option gating, and update workflow documentation to note the bounded ElkSharp refinement behavior.
+
+Completion criteria:
+- [x] Targeted workflow renderer tests cover refinement determinism and `TopToBottom` stability
+- [x] Workflow docs mention the bounded refinement behavior for ElkSharp best-effort layout
+- [x] Sprint execution log records validation results
+
+## Execution Log
+| Date (UTC) | Update | Owner |
+| --- | --- | --- |
+| 2026-03-23 | Sprint created and work started for bounded deterministic ElkSharp edge refinement. | Implementer |
+| 2026-03-23 | Added module-local ElkSharp guidance, implemented bounded orthogonal refinement, updated `docs/workflow/ENGINE.md`, and passed `dotnet test src/Workflow/__Tests/StellaOps.Workflow.Renderer.Tests/StellaOps.Workflow.Renderer.Tests.csproj --filter "FullyQualifiedName~ElkSharp" -v minimal` (15/15). | Implementer |
+
+## Decisions & Risks
+- There was no module-local `AGENTS.md` under `src/__Libraries/StellaOps.ElkSharp/`; this sprint adds one before code changes so the module is no longer undocumented.
+- Cross-module edits are limited to workflow renderer tests and workflow engine docs because the implementation changes a shared library used by those surfaces.
+- The refinement stage must remain deterministic and must not introduce random strategy generation or diagonal output.
+- Updated docs: `docs/workflow/ENGINE.md`
+- Module-local guidance added: `src/__Libraries/StellaOps.ElkSharp/AGENTS.md`
+
+## Next Checkpoints
+- After TASK-002: targeted `dotnet test` run for ElkSharp renderer tests
+- After TASK-003: update sprint statuses and execution log with concrete command results

docs/workflow/ENGINE.md

@@ -920,7 +920,7 @@ The engine can render workflow definitions as visual diagrams.
 
 | Engine | Description |
 |--------|-------------|
-| **ElkSharp** | Port of Eclipse Layout Kernel (default) |
+| **ElkSharp** | Port of Eclipse Layout Kernel (default). In `Best` effort mode it now runs a bounded deterministic orthogonal edge-refinement pass after base routing; `Draft` and `Balanced` keep the base route unless library callers opt in through `ElkLayoutOptions.EdgeRefinement`. |
 | **ElkJS** | JavaScript-based ELK via Node.js |
 | **MSAGL** | Microsoft Automatic Graph Layout |
 
@@ -1020,4 +1020,3 @@ docs/decompiled-samples/
   csharp/           177 .cs files (Roslyn-formatted C# with typed request models)
   json/             177 .json files (indented canonical definitions with JSON Schema)
 ```
-