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gsxdsm d7a02c4d5b FN-7151: free scoped project concurrency slots

Free stopped or paused project engines' leaked slots without disturbing other projects.

- Add scoped semaphore accounting around the shared global agent pool.
- Return residual per-project slots after runtime stop drains aborted agents.
- Keep idle leak reconciliation scoped to the owning project so active projects retain their slots.
- Cover scoped release, reconciliation, project pause, and in-process runtime behavior with tests.

Files changed:
 .../fn-7151-free-concurrency-slots-on-stop.md      |   7 ++
 docs/architecture.md                               |   2 +-
 packages/engine/src/__tests__/concurrency.test.ts  | 126 +++++++++++++++++++++
 .../src/__tests__/project-engine-manager.test.ts   |  60 ++++++++++
 packages/engine/src/concurrency.ts                 | 123 +++++++++++++++++++-
 packages/engine/src/project-engine.ts              |   2 +-
 .../runtimes/__tests__/in-process-runtime.test.ts  |  51 +++++++++
 packages/engine/src/runtimes/in-process-runtime.ts |  22 +++-
 8 files changed, 385 insertions(+), 8 deletions(-)

Fusion-Task-Id: FN-7151

Fusion-Task-Lineage: e59e5e0c-67e8-4f80-a6b9-1ea4febaeb97

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-06-27 20:55:59 -07:00