feat(cockpit): Clawd mascot + live agent chat on Meet your agent

Rework the Meet-your-agent rail into a self-contained agent surface:

- Clawd, the Claude Code pixel crab, animates the LED matrix on a 26x16
  grid, coupled to the chat lifecycle (idle stare / claws pump while
  working / green flash on reply). Static antennas, permanent black eyes.
- A full free-form chat to the default agent (useAgentChat): free text
  goes to the blocking /webhook path so conversational replies actually
  render; the 3 canned prompts stay fire-and-forget + SSE (tool turns).
- Chat and the working log are separate panes; the 3 prompts became
  starter buttons; the ZeroClaw runtime + channels moved into an
  Advanced drawer. The whole agent rail is now theme-aware (light/dark).
- Strip the phase eyebrows from the sidebar + page headers; reduce the
  EnvSetup left column to editorial copy.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/pages/AddBuilder.tsx

@@ -62,7 +62,6 @@ export function AddBuilder() {
     <section>
       <div className="print:hidden">
         <PanelHeading
-          eyebrow="PHASE 5 OF 5 · ~90 MIN · DEADLINE 19:00"
           title="Module 3 · Harness, Loops & submit"
           intro="Finish Layers 4 and 5 — how your node reasons and how it runs over time — review the assembled Agent Design Document, export a PDF, and submit before the deadline."
           size={44}