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gsxdsm 3615b0b19d FN-5941: stop todo/in-progress flapping

Prevent scheduler and self-healing churn from bouncing live tasks between todo and in-progress.

- add dispatch oscillation settings, scheduler settle-window tracking, and auto-pause audit/logging for rapid todo↔in-progress cycles
- harden self-healing against reclaiming genuinely active tasks by checking executor activity, grace windows, and heartbeat runs before requeueing
- cover the new reliability invariants with focused engine tests and document the new diagnostics/settings behavior

Files changed:
 docs/architecture.md                               |   1 +
 docs/diagnostics.md                                |   9 +
 docs/settings-reference.md                         |   3 +
 .../core/src/__tests__/settings-parity.test.ts     |   6 +
 packages/core/src/settings-schema.ts               |   6 +
 packages/core/src/types.ts                         |   9 +
 .../todo-inprogress-flapping.test.ts               | 556 +++++++++++++++++++++
 packages/engine/src/__tests__/scheduler.test.ts    |  14 +-
 .../self-healing-in-progress-limbo.test.ts         |   2 +-
 packages/engine/src/__tests__/self-healing.test.ts |   8 +-
 packages/engine/src/run-audit.ts                   |   8 +
 packages/engine/src/scheduler.ts                   | 113 ++++-
 packages/engine/src/self-healing.ts                | 230 +++++++--
 13 files changed, 928 insertions(+), 37 deletions(-)

Fusion-Task-Id: FN-5941

Fusion-Task-Lineage: babdd85e-d04c-47ca-901c-db692b2874bf

2026-06-07 18:51:47 -07:00