M9 section S1, commit 2. Add src/thoughtsync/responses.py — the app's single
JSON-error shape and the two guards that pair with it:
- json_error(message, status): the one ({"error": ...}, code) builder
- not_found(): the standard 404, by far the most common note-route error
- parse_uuid(raw): parse a path/body id, None on malformed → pair with not_found()
notes.py adopts them everywhere: ~25 hand-built `jsonify({"error":"not found"}),404`
collapse to not_found(); ~20 other error returns to json_error(...); ~13 repeated
`try: uuid.UUID(x) except: ...` blocks to parse_uuid(). Behavior-preserving — same
bodies and status codes, one definition. jsonify stays for the success responses.
Other blueprints (auth, labels, saved_filters, sync, settings_api) adopt the same
helpers in their own M9 sections.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm
