Add static home block renderer and local admin

docs/refactor-admin-plan.md

@@ -166,6 +166,28 @@ Global non-block content:
 5. Add Payload CMS only after static JSON rendering is visually stable.
 6. Optimize media and runtime after block rendering is stable.
 
+## Phase 1 Implementation Status
+
+Started on June 25, 2026.
+
+Implemented:
+
+- `content/pages/home.json` contains the first ordered block model for the home page.
+- `templates/pages/home/shell.html` contains the current Webflow shell with two render slots.
+- `templates/pages/home/blocks/` contains exact HTML block chunks extracted from the current localized page.
+- `tools/render-home.mjs` renders `index.html` from the JSON model and templates.
+- `tools/extract-home-blocks.mjs` can regenerate the first template split from the current `index.html`.
+- `tools/admin-server.mjs` and `admin/` provide a local block editor.
+
+Current guarantee:
+
+- Rendering through `npm run render:home` has byte-for-byte parity with the pre-refactor `index.html`.
+
+Current limitation:
+
+- Blocks are still HTML-template blocks. The admin can manage order, enabled state, duplication, copy/paste, IDs, labels, anchors, and raw block JSON. The next pass must extract text/media fields from each block template into typed JSON fields.
+- The `c-viz` wrapper is preserved as a region boundary because it is coupled to WebGL/color-flip behavior. Blocks inside that region should stay inside it until the runtime is better understood.
+
 ## Optimization Passes
 
 Do after structural parity, not before: