When users modify GSD workflow files (e.g., adding bug workarounds),
those changes get wiped on every /gsd:update. This adds automatic
backup and guided restore:
**install.js changes:**
- Writes `gsd-file-manifest.json` after install with SHA256 hashes
of every installed GSD file
- Before wiping on update, compares current files against manifest
to detect user modifications
- Backs up modified files to `gsd-local-patches/` directory
- Reports backed-up patches after install completes
**New command: /gsd:reapply-patches**
- LLM-guided merge of backed-up modifications into new version
- Handles cases where upstream also changed the same file
- Reports merge status per file (merged/skipped/conflict)
**update.md changes:**
- Warning text now mentions automatic backup instead of manual
- New step after install to check for and report backed-up patches
Flow: modify GSD file → /gsd:update → modifications auto-backed up →
new version installed → /gsd:reapply-patches → modifications merged back
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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