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gsxdsm d0be3e462d FN-6610: harden engine test isolation recovery

Harden shared test isolation seams so engine tests survive mid-run cleanup.

- Recreate owned worker roots, HOME directories, and cwd before child-process launches.
- Add regression coverage for tmpdir redirect, HOME, cwd, SQLite, and git config recovery.
- Revalidate worktree database scratch directories before direct SQLite opens and document the rescue pattern.

Files changed:
 docs/testing.md                                    |  2 +
 packages/core/src/__test-utils__/vitest-setup.ts   | 92 ++++++++++++++++++----
 .../__tests__/vitest-setup-tmp-redirect.test.ts    | 33 ++++++++
 .../src/__tests__/executor-step-session.test.ts    |  6 +-
 .../src/__tests__/worktree-db-hydrate.test.ts      | 22 +++++-
 5 files changed, 135 insertions(+), 20 deletions(-)

Fusion-Task-Id: FN-6610

Fusion-Task-Lineage: 18233ee2-1dfe-4b0d-bd12-e4f5b7f9cc29

2026-06-18 01:20:03 -07:00