- Add comprehensive docstring to Proposal model documenting all relationships
- Add column comments for all fields (title, description, status, project_id, etc.)
- Mark feat_task_id as DEPRECATED (will be replaced by Essential->task mapping in BE-PR-008)
- Add proposal_code hybrid property as preferred alias for DB column propose_code
- Update ProposalResponse schema to include proposal_code alongside propose_code
- Update serializer to emit both proposal_code and propose_code for backward compat
- No DB migration needed -- only Python-level changes
- New canonical model: Proposal, ProposalStatus (app/models/proposal.py)
- New canonical router: /projects/{id}/proposals (app/api/routers/proposals.py)
- Schemas renamed: ProposalCreate, ProposalUpdate, ProposalResponse, etc.
- Old propose.py and proposes.py kept as backward-compat shims
- Legacy /proposes API still works (delegates to /proposals handlers)
- DB table name (proposes), column (propose_code), and permission names
(propose.*) kept unchanged for zero-migration compat
- Updated init_wizard.py comments
