docs(readme): ship UI via typedserver + bundled ts module

Rework the implementation-notes section of readme.ui.md so the UI
delivery story matches ModelGrid's deno-compile single-binary shape.
Adopt the @stack.gallery/registry pattern: a build step bundles ts_web/
into a generated ts_bundled/bundle.ts exporting a path->bytes map that
typedserver serves at runtime. Add a dev-vs-prod asset-source switch so
UI edits stay hot-reloadable during development while release builds
embed the whole console in the binary.

readme.ui.md

@@ -355,17 +355,39 @@ marked with a `restart required` badge, and the UI surfaces a single
   component-per-view under `ts_web/elements/<area>/`, a tiny
   SmartRouter-style client router (`ts_web/router.ts`), and a single
   `appstate.ts` as the store.
+- **Bundled into the binary via `ts_bundled/bundle.ts`.** ModelGrid is a
+  Deno project that ships as a `deno compile` single binary, so the UI
+  follows the `@stack.gallery/registry` pattern: a build step bundles
+  the `ts_web/` sources (HTML, JS, CSS, fonts, icons) into a single
+  generated `ts_bundled/bundle.ts` module that exports a
+  `{ path → bytes | string }` map. The daemon dynamically imports that
+  module at startup and hands the map to **typedserver**, which serves
+  it on the UI port. Result: no external asset directory, no runtime
+  filesystem dependency, one binary still ships the entire console.
+- **Dev vs prod asset source.** In `deno task dev`, typedserver is
+  pointed at `ts_web/` on disk so UI edits are hot-reloadable without
+  re-running the bundler. In `deno task compile` / prod, the bundler
+  regenerates `ts_bundled/bundle.ts` first and the compiled binary
+  serves exclusively from the embedded map. A single flag
+  (`UI_ASSET_SOURCE=disk|bundle`, default `bundle`) picks the strategy
+  at runtime.
+- **Bundler placement.** Mirrors `@stack.gallery/registry`: keep the
+  bundler in `scripts/bundle-ui.ts`, invoke it from a `deno task
+  bundle:ui` that the `compile:all` task depends on, and `.gitignore`
+  the generated `ts_bundled/bundle.ts` so it is only produced during
+  release builds (or regenerated on demand for local prod testing).
 - **Packaging.** Follow dcrouter's module split: `@modelgrid.com/modelgrid`
-  ships the daemon and the UI bundle; a future
+  ships the daemon and the embedded UI bundle; a future
-  `@modelgrid.com/modelgrid-web` can carve out the web boundary if the
+  `@modelgrid.com/modelgrid-web` can carve out the web sources as their
-  bundle grows large.
+  own publishable boundary if the bundle grows large or the UI needs to
+  be consumed independently.
 - **Dark theme default** (black background, high-contrast foreground) to
   match dcrouter and the expected server-ops environment. Light theme
   is a later toggle.
-- **No server-side rendering.** The UI is a static SPA served by the
+- **No server-side rendering.** The UI is a static SPA; typedserver
-  daemon; all data is fetched through the API. This keeps the runtime
+  returns the asset map's `index.html` for the app shell and the rest
-  surface small and makes the UI-less `curl` story identical to the UI
+  of the state comes from the API. This keeps the runtime surface
-  story.
+  small and makes the UI-less `curl` story identical to the UI story.
 
 ## ❓ Open Questions