Three-phase CLAUDE.md cleanup. Phase A rotates old Decisions Log entries into monthly archive files, builds/updates an index, and adds a grep-pattern navigation header. Phase B consolidates recurring failure patterns (2+ instances) into a canonical "Known Patterns & Gotchas" section with current ins
Three-phase CLAUDE.md cleanup. Phase A rotates old Decisions Log entries into monthly archive files, builds/updates an index, and adds a grep-pattern navigation header. Phase B consolidates recurring failure patterns (2+ instances) into a canonical "Known Patterns & Gotchas" section with current instance counts. Phase C extracts stable reference sections (architecture, file maps, data layouts) int