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gsxdsm 12a6d1bc6a FN-7511: add planner overseer stage monitoring

Add records-only planner overseer monitoring across in-flight task lifecycle stages.

- Add a PlannerOverseerMonitor with normalized observations and deterministic watched-stage resolution.
- Wire ProjectEngine to poll in-progress and in-review tasks, gated by effective planner oversight level.
- Document the monitoring seam and add focused coverage plus a release changeset.

Files changed:
 .changeset/fn-7511-planner-overseer-monitoring.md  |   7 +
 docs/architecture.md                               |  26 ++
 docs/workflow-steps.md                             |   2 +
 .../engine/src/__tests__/planner-overseer.test.ts  | 294 ++++++++++++++++++
 packages/engine/src/index.ts                       |  12 +
 packages/engine/src/planner-overseer.ts            | 338 +++++++++++++++++++++
 packages/engine/src/project-engine.ts              |  93 +++++-
 7 files changed, 771 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-7511

Fusion-Task-Lineage: 81b616cf-47e9-4769-b02d-fc7ebd3fcb2f

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

2026-07-04 12:55:25 -07:00