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gsxdsm 36f20f835e FN-8822: prevent worktree capacity leaks

Keep live-task capacity admission visible and consistent across all lifecycle lanes.

- Report canonical active holders when worktree or concurrent-task capacity is exhausted.
- Persist deduplicated queue reasons for merge, triage, and workflow-continuation admission.
- Cover retained worktree behavior and document the capacity model.

Files changed:
 .changeset/fn-8822-worktree-capacity-leak.md       |  7 +++
 docs/architecture.md                               |  1 +
 docs/settings-reference.md                         |  4 +-
 .../src/__tests__/agent-heartbeat-worktree.test.ts | 11 ++++-
 .../engine/src/__tests__/project-engine.test.ts    |  4 ++
 ...ecutor-no-task-done-vs-worktree-reclaim.test.ts | 55 +++++++++++++++++++---
 ...admission-worktree-ledger-renamed-lanes.test.ts |  4 ++
 .../workflow-continuation-capacity.test.ts         |  8 +++-
 .../src/__tests__/worktree-acquisition.test.ts     |  6 +--
 packages/engine/src/concurrency/concurrency.ts     | 22 +++++++++
 packages/engine/src/project-engine.ts              | 34 ++++++++++++-
 packages/engine/src/runtimes/in-process-runtime.ts | 33 ++++++++++++-
 packages/engine/src/scheduler.ts                   | 53 ++++++++++-----------
 packages/engine/src/triage.ts                      | 18 +++++++
 14 files changed, 215 insertions(+), 45 deletions(-)

Fusion-Task-Id: FN-8822

Fusion-Task-Lineage: 73eda70b-2b74-4b49-a0ff-29d41fd9aab8

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

2026-08-07 21:43:28 -07:00