docs: group solver evidence by feature

docs/linear-static-3d-euler-beam/coordination.md

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+# Linear Static 3D Euler Beam Coordination Report
+
+## Metadata
+
+- feature_id: linear-static-3d-euler-beam
+- status: completed
+- owner_agent: coordinator-agent
+- date: 2026-08-15
+- migration_note: Existing evidence was relocated without rerunning workflow gates.
+
+## Worklist
+
+| stage | owner | status | evidence |
+| --- | --- | --- | --- |
+| 1. requirements | requirement-agent | passed | `requirements.md` |
+| 2. research | research-agent | passed | `research.md` |
+| 3. formulation | formulation-agent | passed | `formulation.md` |
+| 4. numerical and reference | numerical-review-agent | passed | `numerical-review.md`; `reference-model.md` |
+| 5. I/O | io-definition-agent | passed | `io.md` |
+| 6. implementation and verification | implementation-planning-agent; implementation-agent | passed | `implementation-plan.md`; `implementation-report.md`; `build-test.md`; `reference-comparison.md` |
+| 7. physics | physics-evaluation-agent | passed | `physics-evaluation.md` |
+| 8. release | release-agent | passed | `release.md` |
+
+## Current Progress
+
+- active_sub_agent: none
+- next_handoff: none
+- closure_evidence: `release.md` status `ready-for-release`
+- workflow_disposition: completed
+
+## Decision Log
+
+| date | decision | evidence | rationale |
+| --- | --- | --- | --- |
+| 2026-08-15 | Record migrated workflow as completed | `release.md` | Preserve the existing release verdict without retroactive gate execution. |
+
+## Blockers and Rework
+
+- active_blockers: none
+- correction_attempt_count: 0
+- needs_user_decision: false