feat(phase-2): implement file cleanup and fix warnings

[laynepenney]

Summary

Phase 2 of Production Readiness Plan: Clean up warnings and implement high-priority TODOs.

Changes

Phase 2 Complete ✅

Warnings Fixed:

• Removed unused load_session function from main.rs
• Clean build with zero warnings

HIGH Priority TODOs Resolved:

1. File Cleanup (symbol_index/indexer.rs:561)

   • Added get_all_files() method to SymbolDatabase
   • Implemented cleanup_deleted() to remove stale entries
   • Files checked against disk and deleted from DB if missing

2. Usage Detection (symbol_index/service.rs:206)

   • Added find_imports_with_symbol() database method
   • find_references() now finds all imports referencing a symbol
   • Returns import locations with file paths

3. Dependency Graph (symbol_index/service.rs:229)

   • Added get_file_dependencies() and get_file_dependents() database methods
   • Implemented BFS traversal in get_dependencies()
   • Supports both Imports and ImportedBy directions
   • Configurable max depth (default: 3 levels)

Documentation Updated:

• Updated PRODUCTION_READINESS_PLAN.md with Phase 2 progress
• Marked Phase 1 as complete
• Documented remaining LOW priority TODOs for Phase 4

Verification

• ✅ Clean build with zero warnings
• ✅ All HIGH priority TODOs resolved
• ✅ All 516 tests pass
• ✅ No behavioral regressions

Files Changed

• codi-rs/docs/PRODUCTION_READINESS_PLAN.md
• codi-rs/src/main.rs
• codi-rs/src/symbol_index/database.rs
• codi-rs/src/symbol_index/indexer.rs
• codi-rs/src/symbol_index/service.rs

Related

• Implements Phase 2 of docs/PRODUCTION_READINESS_PLAN.md