[Phase 0] Full Codebase Audit

[Shlok148Dev]

Phase 0 — Codebase Audit Complete

Four documents committed to docs/audit/:

• EXISTING_INVENTORY.md — every file graded
• GAP_ANALYSIS.md — full feature gap map
• REBUILD_PLAN.md — ordered task list by phase
• SPRINT_BOARD.md — live task tracker

Summary

Metric	Value
Total files	123
COMPLETE	119
PARTIAL	1
STUB	3
BROKEN	0
EMPTY	0
Overall completion	96.75%

Immediate P1 blockers

ID	Issue	File	Fix
TD-001	Hardcoded Supabase default DATABASE_URL	backend/app/db/database.py	Remove hardcoded fallback; raise a RuntimeError if environment variable is not defined.
TD-002	Missing Next.js Error Boundaries	frontend/src/app	Create root-level error.tsx and global-error.tsx pages.
TD-003	Missing Alembic Configuration	backend/	Run alembic init to initialize the migrations directory; migrate existing SQL schemas.

@Shlok148Dev — review and merge to unblock Phase 1.