Add Loop Wiki local knowledge store

[rlaope]

Summary

• Add markdown-first Loop Wiki storage under .loop/wiki/user, with derived AI memory, index, and graph artifacts.
• Add loop wiki list/read/open/serve plus localhost-only dashboard startup controls for loop run.
• Make post-policy wiki writes part of CLI success, with exit code 6 after durable run state is preserved on wiki failures.
• Harden run/wiki identity and data ownership: nonce-backed run IDs, hashed note IDs, and persistent preservation of human-edited canonical markdown.

Verification

• node --test test/wiki-store.test.js test/adapter.test.js test/safety.test.js
• npm test
• npm run lint
• npm run typecheck
• git diff --check
• npm audit --omit=dev
• npm pack --dry-run --json

Review

• Code review lane: 0 issues after fixes; final recommendation COMMENT only because optional LSP/AST tools were unavailable in this session, with tsc --noEmit and rg used as substitutes.
• Architecture lane: CLEAR.

Risks

• Dashboard startup is intentionally optional and soft-fail; run execution does not depend on dashboard availability.