split: cleanup migrated artifacts (step 13 — split done)
Removed (now lives in .workshop/, see commits 4608ba9..f8f6f1a there):
- .archive/* (8 archived buffers from 2026-05-05..2026-05-07)
- .brainstorm/* (6 untracked brainstorm buffers — never tracked here, just on disk)
- .wiki/concepts/modulair-rag-brainstorm-trace.md (workshop-meta methodology trace)
- .wiki/raw/naming/* (untracked, naming research clipping)
- .wiki/raw/research/* (modulair, code-review, tokens-economy/, hermes-agent-skills/)
- .claude/skills/meeting-room-promote-brainstorm/SKILL.md (renamed → workshop-promote-brainstorm in workshop repo)
Kept: scenarios/, config/, .wiki/raw/transcripts/, .wiki/entities/, .wiki/concepts/meeting-room-architecture.md (runtime-only rewrite),
.claude/skills/{meeting-room-start-meeting,meeting-room-register-persona}/.
Promoted history of the split decision: .workshop/.wiki/concepts/meeting-room-split.md.