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>

tests/unit/api/test_websocket_bridge.py

@@ -13,6 +13,7 @@ from uuid import uuid4
 
 import pytest
 from roboco.api.websocket_bridge import (
+    _handle_a2a_message_event,
     _handle_agent_event,
     _handle_message_event,
     _handle_notification_sent,
@@ -429,6 +430,44 @@ async def test_handle_usage_snapshot_broadcasts_to_system() -> None:
     assert len(msg["by_agent"]) == 1
 
 
+# ---------------------------------------------------------------------------
+# _handle_a2a_message_event
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_handle_a2a_message_event_broadcasts_to_system() -> None:
+    """An A2A_MESSAGE_SENT event is forwarded to /ws/system as an
+    `a2a.message` frame — the CEO's live view of every agent-to-agent chat."""
+    event = _evt(
+        EventType.A2A_MESSAGE_SENT,
+        {
+            "conversation_id": "conv-1",
+            "message_id": "msg-1",
+            "task_id": "task-1",
+            "from_agent": "be-dev-1",
+            "to_agent": "be-qa",
+            "skill": "code_review",
+            "body_excerpt": "please review",
+            "timestamp": "2026-07-02T00:00:00+00:00",
+        },
+    )
+    with patch("roboco.api.websocket_bridge.manager") as mgr:
+        mgr.broadcast_system = AsyncMock()
+        await _handle_a2a_message_event(event)
+    mgr.broadcast_system.assert_awaited_once()
+    msg = mgr.broadcast_system.await_args.args[0]
+    assert msg["type"] == "a2a.message"
+    assert msg["conversation_id"] == "conv-1"
+    assert msg["message_id"] == "msg-1"
+    assert msg["task_id"] == "task-1"
+    assert msg["from_agent"] == "be-dev-1"
+    assert msg["to_agent"] == "be-qa"
+    assert msg["skill"] == "code_review"
+    assert msg["body_excerpt"] == "please review"
+    assert msg["timestamp"] == "2026-07-02T00:00:00+00:00"
+
+
 # ---------------------------------------------------------------------------
 # Registration + start
 # ---------------------------------------------------------------------------
@@ -465,6 +504,8 @@ def test_register_websocket_bridge_handlers_subscribes_all_event_types() -> None
     assert EventType.USAGE_SNAPSHOT in types
     # Message delivery forwarded to /ws/channels + /ws/sessions.
     assert EventType.MESSAGE_SENT in types
+    # A2A live chat forwarded to /ws/system (CEO live view).
+    assert EventType.A2A_MESSAGE_SENT in types
 
 
 @pytest.mark.asyncio