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.

.wiki/log.md

@@ -34,3 +34,4 @@ Events: `started`, `promoted`, `registered`, `archived`.
 2026-05-07 amended tdd-criteria post-promotion: anti-loophole rule 4 (test-immutability + [test-modify: was X; is Y] marker + separate-commit-from-impl) added; user surfaced symmetric vandalism risk on tests after initial promotion. Patches landed: claude-skills#tdd-criteria-skill-write description updated (commit b7819b17), claude-skills#tdd-criteria-precommit-hook task created (commit d440bb52). Design-doc amendment NOT applied directly (knowledge_ingest is create-only — overwrite blocked); amendment text embedded in skill-write task description for impl session to apply via direct git edit.
 2026-05-08 split meeting-room into multi-agent runtime (this zone) + .workshop/ boss-zone; remote workshop repo created at git.kzntsv.site/OpeItcLoc03/workshop.git
 2026-05-08 amended meeting-room-architecture.md: split-rewrite (runtime-only); boss sections moved to .workshop/.wiki/concepts/workshop-architecture.md
+2026-05-08 split-done cleanup: removed .archive/, .brainstorm/, .wiki/concepts/modulair-rag-brainstorm-trace.md, .wiki/raw/{naming,research}/, .claude/skills/meeting-room-promote-brainstorm/. All artifacts migrated to .workshop/ (commits 4608ba9..f8f6f1a in workshop repo). Promoted concept: .workshop/.wiki/concepts/meeting-room-split.md.