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gsxdsm 259cdfb531 FN-6734: stabilize CLI extension test cleanup

Stabilize the CLI extension regression lane by closing cached stores before temp fixture removal.

- Close extension store caches and manually created TaskStore/AgentStore handles before deleting per-test fixture roots.
- Add a regression guard for the cached TaskStore close-before-remove invariant.
- Reduce oversized task-list truncation fixtures while preserving bounded-output assertions.
- Document the CLI affected-lane rescue pattern for store leaks, fixture sizing, and runtime-dist mocking order.

Files changed:
 docs/testing.md                                    |   4 +
 .../extension-agent-set-instructions.test.ts       |   3 +-
 .../__tests__/extension-goal-tools-audit.test.ts   |   3 +-
 .../cli/src/__tests__/extension-goal-tools.test.ts |   3 +-
 .../cli/src/__tests__/extension-insights.test.ts   |   3 +-
 .../__tests__/extension-mission-goal-tools.test.ts |   3 +-
 packages/cli/src/__tests__/extension.test.ts       | 221 +++++++++++++--------
 .../src/__tests__/research-extension-tools.test.ts |  40 +++-
 8 files changed, 186 insertions(+), 94 deletions(-)

Fusion-Task-Id: FN-6734

Fusion-Task-Lineage: efe91c0f-f84c-471c-8067-65a244b2aec7

2026-06-19 16:47:33 -07:00