feat(F-048): completed feature

work/artifacts/F-048/documenter.md

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+# Documenter — F-048
+
+## Updated documentation
+
+- `docs/context-handoff.md` now documents the script-only ticket lifecycle:
+  - interactive creation with `new_ticket.py`;
+  - exclusive promotion to `in_progress` with `--start`;
+  - legacy gate normalization with `--normalize-gates`;
+  - final close/commit with `close_feature.py`.
+- Swagger shared error schema was aligned in code with the public envelope `{ error, requestId }`; generated `/docs` reflects it automatically.
+- Implementer evidence records migration, build, test and upload-auth behavior.
+
+## User-facing/API notes
+
+- Admin image upload now requires a valid backoffice session. Unauthenticated calls return HTTP 401.
+- Uploaded image extension is selected server-side and invalid image signatures return HTTP 400.
+- Existing upload URLs remain `/uploads/<filename>`.
+- API error validation code remains stable as `VALIDATION_ERROR`.
+
+## Operational notes
+
+- There is no configured `origin` remote, so close creates a local commit and reports push as skipped.
+- Product validation commands are listed in `work/artifacts/F-048/implementer.md` and QA traceability in `qa.json`.