fusion

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gsxdsm 080a8e7134 FN-8464: guard baseline capture against invalid worktrees

Prevent baseline Git probes from using stale or non-directory task worktrees.

- Gate baseline capture on an existing worktree directory
- Defer graph step projection until worktree acquisition completes
- Cover missing, non-directory, and filesystem-race worktree paths
- Add a patch changeset for the operator-facing fix

Files changed:
 .changeset/fn-8464-baseline-cwd.md                 |   7 ++
 .../__tests__/executor-fast-mode-workflows.test.ts | 100 ++++++++++++++++++++-
 .../engine/src/__tests__/executor-test-helpers.ts  |   6 +-
 packages/engine/src/__tests__/step-runner.test.ts  |  62 +++++++++++++
 packages/engine/src/executor.ts                    |  16 +++-
 packages/engine/src/step-runner.ts                 |  24 +++++
 6 files changed, 210 insertions(+), 5 deletions(-)

Fusion-Task-Id: FN-8464

Fusion-Task-Lineage: e4116dd0-decd-4f9d-87f0-e695cc7f182b

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

2026-07-21 19:40:36 -07:00