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gsxdsm 9ce698699a FN-8917: add telemetry seams to merger test stores

Ensure merger test fixtures model session-usage telemetry so user-hold release coverage exercises the production lane.

- Add emitUsageEvent fakes across merger AI test stores.
- Assert the user-held branch-group member emits merger session telemetry when explicitly released.
- Document fixture requirements and expected hold-path stderr.

Files changed:
 .../src/__tests__/group-merge-coordinator.test.ts   | 21 +++++++++++++++++++++
 .../engine/src/__tests__/merger-ai-cleanup.test.ts  |  1 +
 .../merger-ai-dependency-install.slow.test.ts       |  1 +
 .../__tests__/merger-ai-push-after-merge.test.ts    |  1 +
 .../src/__tests__/merger-ai-renamed-columns.test.ts |  6 ++++++
 .../ai-merge-cleanup-enoent-idempotent.test.ts      |  1 +
 6 files changed, 31 insertions(+)

Fusion-Task-Id: FN-8917

Fusion-Task-Lineage: aab96cdb-50ec-441f-80f5-944e8e1d70ab

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

2026-08-09 16:09:55 -07:00