CLAUDE.md: fix stale counts (types 14 to 15, SSE events ~118 to ~120),
remove redundant footer sections (References list duplicated inline citations;
Common Workflows bullets were self-evident or already stated; Tunnel/Memory
Leak Prevention folded into neighboring sections). 251 to 234 lines.
Move 22 completed implementation/phase/audit plans to docs/archive/ via
git mv so history is preserved. Living reference docs remain in docs/.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>