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gsxdsm 55ba994ae9 FN-6096: run worktree init command in post-merge worktrees

Run the configured worktree init command before post-merge workflow steps use their temporary worktree.

- execute the configured worktreeInitCommand inside isolated post-merge worktrees before workflow steps run
- log successful and failed post-merge init outcomes while keeping workflow-step execution non-fatal on init failure
- add merger tests covering configured init execution, missing init configuration, and init-command failure handling

Files changed:
 packages/engine/src/__tests__/merger-post-merge.test.ts | 156 +++++++++++++++++++++
 packages/engine/src/merger.ts                      |  71 +++++++++-
 2 files changed, 226 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-6096

Fusion-Task-Lineage: 32ba5e62-cffd-4d94-bd23-a7ce2df3cbf9

2026-06-09 12:50:26 -07:00