CLAUDE.md Documentation Cleanup and Consolidation

Use context architecture skill to scrub all old documentation, including instructions, specs, trackers, ADRs - delete everything superseeded and stale, remove references to historical decisions, delete duplicates, single home everything and make sure all documentation is accessible from CLAUDE.md router in a few steps

Scrubbed docs per context-architecture playbook: checker green, no stale specs/trackers/ADRs/duplicates found; all docs routed from CLAUDE.md. No change needed, no PR.