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gsxdsm cf23c6f571 FN-5909: run configured merge bootstrap before verification

Ensure AI merge verification reuses the configured worktree bootstrap command.

- run merge dependency sync unconditionally when a non-blank worktreeInitCommand is configured
- reuse the configured init command instead of inferred package-manager install commands during merge verification
- add merger verification coverage for warm/cold worktrees, inferred-install fallback, and whitespace-only init commands
- document the expanded worktreeInitCommand behavior and add a published changeset

Files changed:
 .changeset/fn-5909-merge-install-script.md         |   5 +
 docs/settings-reference.md                         |   2 +-
 packages/engine/src/__tests__/merger-verification.test.ts      | 159 +++++++++++++++------
 packages/engine/src/merger.ts                      |  30 +++-
 4 files changed, 143 insertions(+), 53 deletions(-)

Fusion-Task-Id: FN-5909

Fusion-Task-Lineage: 8530c641-9574-45e2-b9ac-82e42c9c00a7

2026-06-02 18:43:29 -07:00