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Fusion Agent 33f4797ceb FN-126: fix inert sync-lane validation

Prevent inert synchronization lanes from bypassing merge-gate validation while preserving task-lane cache and archive lifecycle behavior.

- Reject sync-resolved lane conversions in the static validator.
- Preserve task-lane cache emissions and active-session cleanup across task mutations and archival.
- Add regression coverage, baseline updates, documentation, and a release changeset.

Files changed:
 .changeset/fn-126-inert-sync-lane.md               |   7 +
 .../a-falling-count-is-not-evidence.md             |  12 +
 .../task-lane-cache-emitter-preservation.test.ts   | 269 +++++++++++++++++++++
 .../core/src/task-store/archive-lifecycle-2.ts     |   3 +-
 packages/core/src/task-store/moves.ts              |   3 +-
 packages/core/src/task-store/task-artifacts-ops.ts |   3 +-
 packages/core/src/task-store/task-update.ts       |   3 +-
 packages/core/src/task-store/update-task-deps.ts   |   3 +-
 ...xecutor-archive-releases-active-session.test.ts |  80 ++++++
 packages/engine/src/executor.ts                    |   4 +-
 .../src/executor/executor-side-effect-hosts.ts     |   2 +-
 .../executor/is-backward-move-out-of-planning.ts   |   7 +-
 .../src/executor/task-executor-graph-facades.ts    |   2 +-
 .../engine/src/executor/task-executor-imports.ts   |   1 -
 .../engine/src/executor/wire-executor-lifecycle.ts |  18 +-
 .../check-inert-sync-lane-conversions.test.mjs     |  83 +++++--
 scripts/check-inert-sync-lane-conversions.mjs      |  19 +-
 scripts/lib/inert-sync-lane-baseline.json          |   6 +-
 18 files changed, 479 insertions(+), 46 deletions(-)

Fusion-Task-Id: FN-126

Fusion-Task-Lineage: 0c7a1a3a-9446-44f8-955d-df6c402dfd31

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

2026-08-23 01:36:12 +00:00