Give the Live UI surface inventory one definition again

The list of Live chrome surfaces was inlined into live-browser.js as a
function-scope const when live/ui-core.mjs was deleted for having zero
in-repo references. It had one out-of-repo reference. The private
impeccable-site repo imports it at build time: its Live UI lab must hold
a snapshot for every surface Live defines, and the site build fails with
the surface name when one is missing. Inlining put the list out of reach
of every Node importer, so the site had to regex it back out of the
browser script, and the guard only kept passing because the site's
materialized copy of skill/ was stale.

A guard that reads a list the site itself maintains guards nothing, so
the fix is a real export rather than a better parser.

skill/scripts/live/ui-surfaces.mjs is now the single definition. The
browser-runtime constraint is unchanged and satisfied the same way the
command palette already solves it: live-browser.js is served raw and
injected as a classic <script>, so it cannot import an ES module. The
/live.js assembler serializes the module into
window.__IMPECCABLE_LIVE_UI_SURFACES__ in the prelude it already writes
for the token, port and vocabulary, and live-browser.js reads the global.
assembleLiveBrowserScript defaults the value from the module rather than
taking it from live-server.mjs, so the bundle carries the canonical
inventory by construction instead of by a caller remembering to pass it.

The emitted inventory is byte-identical to the inlined one.

tests/live-ui-surfaces.test.mjs pins both halves of the seam: the module
is the definition (live-browser.js must not redeclare it), the prefix the
module builds ids from matches the PREFIX live-browser.js hardcodes, and
the assembled bundle still carries the list. live-server.test.mjs gets
the matching integration check against a served /live.js.

One existing assertion changed. live-browser-regression.test.mjs checked
that the steer Send control is registered as live chrome by matching the
text of the inline literal's last line. That encoded where the list was
written, not what it contains; it now asserts membership in the imported
LIVE_UI_COMPONENT_IDS, which is the behaviour it was after.

Verified with the full default suite plus a live-e2e fixture run
(vite8-react-modal), so the overlay is exercised end to end in a browser.

AI-assisted via Claude Code under maintainer direction.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

skill/scripts/live-browser.js

@@ -97,23 +97,20 @@
     return { value: c.value, label: c.label };
   });
 
-  const LIVE_CHROME_MOUNT_CONTRACT = ['root', 'transport', 'state', 'actions'];
-  const LIVE_UI_SURFACES = [
-    { key: 'global-bottom-bar', ids: [PREFIX + '-global-bar', PREFIX + '-global-bar-brand', PREFIX + '-pick-toggle', PREFIX + '-insert-toggle', PREFIX + '-detect-toggle', PREFIX + '-detect-badge', PREFIX + '-design-toggle', PREFIX + '-page-chat', PREFIX + '-page-chat-input', PREFIX + '-page-chat-voice', PREFIX + '-page-chat-send'] },
-    { key: 'pending-copy-edit-dock', ids: [PREFIX + '-pending-dock'] },
-    { key: 'element-selection-chrome', ids: [PREFIX + '-highlight', PREFIX + '-tooltip', PREFIX + '-bar', PREFIX + '-selection-pill', PREFIX + '-input', PREFIX + '-configure-voice', PREFIX + '-configure-bar-tooltip'] },
-    { key: 'action-picker', ids: [PREFIX + '-picker'] },
-    { key: 'edit-chrome', ids: [PREFIX + '-edit-badge'] },
-    { key: 'generating-row', ids: [PREFIX + '-bar', PREFIX + '-shader'] },
-    { key: 'variant-cycling-row', ids: [PREFIX + '-bar', PREFIX + '-params-panel'] },
-    { key: 'variant-params-panel', ids: [PREFIX + '-params-panel'] },
-    { key: 'saving-confirmed-rows', ids: [PREFIX + '-bar'] },
-    { key: 'insert-mode-chrome', ids: [PREFIX + '-insert-line', PREFIX + '-insert-placeholder', PREFIX + '-placeholder-resize', PREFIX + '-insert-input', PREFIX + '-insert-voice', PREFIX + '-insert-create', PREFIX + '-insert-create-tooltip'] },
-    { key: 'annotation-chrome', ids: [PREFIX + '-annot', PREFIX + '-annot-svg', PREFIX + '-annot-pins', PREFIX + '-annot-clear'] },
-    { key: 'design-system-panel', ids: [PREFIX + '-design-host'] },
-    { key: 'toasts-and-errors', ids: [PREFIX + '-toast', PREFIX + '-mount-error'] },
-    { key: 'css-isolation-boundary', ids: [PREFIX + '-root'] },
-  ];
+  // The Live chrome inventory (which surfaces exist, and the element ids each
+  // one owns) comes from the canonical source, skill/scripts/live/ui-surfaces.mjs,
+  // which the /live.js assembler serializes into these globals alongside the
+  // token/port/vocabulary. This file is served raw and injected as a classic
+  // script, so it cannot import that module; the private impeccable-site repo
+  // imports it directly to check its Live UI lab holds a snapshot for every
+  // surface, which only works while the list has exactly one definition.
+  // Add a surface in ui-surfaces.mjs, not here.
+  const LIVE_CHROME_MOUNT_CONTRACT = Array.isArray(window.__IMPECCABLE_LIVE_MOUNT_CONTRACT__)
+    ? window.__IMPECCABLE_LIVE_MOUNT_CONTRACT__
+    : ['root', 'transport', 'state', 'actions'];
+  const LIVE_UI_SURFACES = Array.isArray(window.__IMPECCABLE_LIVE_UI_SURFACES__)
+    ? window.__IMPECCABLE_LIVE_UI_SURFACES__
+    : [];
   const LIVE_UI_COMPONENT_IDS = [...new Set(LIVE_UI_SURFACES.flatMap((surface) => surface.ids))];
 
   //