Wave 2 features: A2A live view (CEO chime-in + reply budget) and prompter memory (#297)

* feat(a2a): live view — watch fleet conversations, CEO chime-in, reply budget

A2A_MESSAGE_SENT published from A2AService.send (excerpt-capped) and
fanned through the existing /ws/system bridge; CEO-only admin REST for
conversations/messages + a reply route on the publish-bearing send path;
panel /a2a page with live transcript and a composer gated on task-linked
conversations. The matrix gains its one asymmetric rule: CEO may message
anyone, nobody may target the CEO — and agent replies inside a
CEO-opened conversation are hard-budgeted to one per CEO message
(per conversation, per agent), rejected with wait-don't-retry guidance.
Built subagent-driven (Sonnet 5), reviewed; v1 seams documented in the
map delta.

* feat(prompter): intake remembers the task history

Intake spawns now carry a per-project chronological digest of recent
tasks (capped: 15 lines/project, 4000 chars total — ~300-1000 tokens)
merged into the ambient layer, and the interviewer gets a bounded
search_past_tasks tool (one shared implementation behind the grok MCP
tool and the Claude SDK in-process tool) to check precedent
mid-conversation. Informational memory only — the sequencing analyzer
keeps ownership of ordering. Built subagent-driven (Sonnet 5), reviewed;
pre-existing conventions-ambient MegaTask-scope gap flagged, untouched.

---------

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

panel/src/components/layout/sidebar.tsx

@@ -23,6 +23,7 @@ import {
   Cpu,
   Sparkles,
   Building2,
+  Radio,
 } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { ScrollArea } from "@/components/ui/scroll-area";
@@ -50,6 +51,7 @@ export const navItems = [
 
   // History
   { title: "Communications", href: "/communications", icon: MessageSquare },
+  { title: "A2A Live", href: "/a2a", icon: Radio },
   { title: "Journals", href: "/journals", icon: BookOpen },
 
   // System