Manually land RUFU-018 fix bypassing the AI merge pipeline.
## Summary
- Add `noCommitsExpected` flag to `LandRepoContext`; skip dependency
sync when set
- Forward `COREPACK_HOME`/`PNPM_HOME`/`npm_config_registry` in
`installWorktreeDependencies`
- Add comprehensive tests for both changes
This unblocks all downstream RUFU audit tasks.
## Surface Enumeration
- Providers/bridges: `installWorktreeDependencies` called from
`landOneRepo` (AI merge) and legacy `merger.ts`; `landOneRepo` called
from `runAiMerge` and `landWorkspaceTask`
- Data states: `noCommitsExpected` can be `true`, `false`, or
`undefined` — both callers use `=== true` strict check
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Improved support for tasks that do not produce commits by skipping
unnecessary dependency installation during merges.
- Preserved normal merge and review behavior when dependency
installation is skipped.
- **Bug Fixes**
- Dependency installation now correctly preserves relevant
package-manager and system environment settings.
- Reduced installation failures caused by missing or unavailable
package-manager configuration.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Fusion <noreply@runfusion.ai>
Co-authored-by: gsxdsm <gsxdsm@users.noreply.github.com>
8d6acf1314