feat(agency): add coach meta-agent and complete memory brief command (WP-0002 T12-T14)

- Add agents/agent-coach.md: new meta-category coaching agent that reads
  all project agent memories, synthesises cross-agent briefs, and produces
  targeted orientation briefs for incoming agents
- Complete memory brief command: now reads all .kaizen/agents/*/memory.md,
  formats structured orientation output following coach agent spec, adds
  --raw flag for unformatted dump
- Coach validates and appears under kaizen-agentic list --category meta

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/kaizen_agentic/cli.py

@@ -824,41 +824,78 @@ session_count: 0
 @memory.command("brief")
 @click.argument("agent_name")
 @click.option("--target", "-t", default=".", help="Project root (default: current)")
-def memory_brief(agent_name: str, target: str):
+@click.option("--raw", is_flag=True, help="Dump raw memory files without synthesis header")
+def memory_brief(agent_name: str, target: str, raw: bool):
     """Print a coach-synthesised orientation for an agent.
 
-    Reads this agent's memory and all other agent memories in the project.
-    Coach agent integration is pending (T13 — see KAIZEN-WP-0002).
-    Currently prints the agent's own memory as a starting orientation.
+    Reads all agent memories in the project and formats an orientation brief
+    for the specified agent, following the coach agent (agents/agent-coach.md)
+    output format. Pass to a Claude session with the coach agent loaded for
+    full LLM synthesis.
     """
-    memory_path = _memory_path(target, agent_name)
-    kaizen_dir = Path(target).resolve() / ".kaizen" / "agents"
+    project_root = Path(target).resolve()
+    kaizen_dir = project_root / ".kaizen" / "agents"
+    project_name = project_root.name
 
-    click.echo(f"=== Agent Brief: {agent_name} ===\n")
+    # Collect all agent memories
+    own_memory: Optional[str] = None
+    other_memories: dict = {}
 
-    # Show own memory
-    if memory_path.exists():
-        click.echo(f"--- Memory: {agent_name} ---")
-        click.echo(memory_path.read_text())
-    else:
-        click.echo(f"No memory file found for '{agent_name}'. Run: memory init {agent_name}")
-
-    # List other agents with memory in this project
-    other_agents = []
     if kaizen_dir.exists():
-        for agent_dir in kaizen_dir.iterdir():
-            if agent_dir.is_dir() and agent_dir.name != agent_name:
-                mf = agent_dir / "memory.md"
-                if mf.exists():
-                    other_agents.append(agent_dir.name)
+        for agent_dir in sorted(kaizen_dir.iterdir()):
+            if not agent_dir.is_dir():
+                continue
+            mf = agent_dir / "memory.md"
+            if not mf.exists():
+                continue
+            if agent_dir.name == agent_name:
+                own_memory = mf.read_text()
+            else:
+                other_memories[agent_dir.name] = mf.read_text()
 
-    if other_agents:
-        click.echo(f"\n--- Other agents with memory in this project: {', '.join(other_agents)} ---")
-        click.echo("(Coach synthesis not yet available — use 'memory show <agent>' to read each)")
+    if raw:
+        if own_memory:
+            click.echo(f"=== {agent_name} ===\n{own_memory}")
+        for name, content in other_memories.items():
+            click.echo(f"=== {name} ===\n{content}")
+        return
+
+    from datetime import date as _date
+    today = _date.today().isoformat()
+    sources = ([agent_name] if own_memory else []) + list(other_memories.keys())
+
+    click.echo(f"## Orientation Brief for: {agent_name}")
+    click.echo(f"Project: {project_name}")
+    click.echo(f"Generated: {today}")
+    click.echo(f"Sources: {', '.join(sources) if sources else 'none'}")
+    click.echo()
+
+    if not sources:
+        click.echo("No agent memory files found in this project.")
+        click.echo(f"  Run: kaizen-agentic memory init {agent_name}")
+        click.echo("  Then load the coach agent (agents/agent-coach.md) for synthesis.")
+        return
+
+    # Own memory section
+    if own_memory:
+        click.echo("### Your Memory")
+        click.echo(own_memory)
     else:
-        click.echo("\nNo other agent memories found in this project.")
+        click.echo(f"### Your Memory\n(none — run: kaizen-agentic memory init {agent_name})\n")
 
-    click.echo("\nNote: Full coach synthesis will be available once agent-coach is implemented (KAIZEN-WP-0002 T12-T13).")
+    # Cross-agent context
+    if other_memories:
+        click.echo("### Context From Other Agents")
+        click.echo("(Load coach agent for full synthesis. Raw content below.)\n")
+        for name, content in other_memories.items():
+            click.echo(f"--- {name} ---")
+            click.echo(content)
+    else:
+        click.echo("### Context From Other Agents\nNo other agent memories found in this project.\n")
+
+    click.echo("---")
+    click.echo("Tip: Load agents/agent-coach.md in your Claude session and pass this output")
+    click.echo("     for a full cross-agent synthesis and orientation brief.")
 
 
 @memory.command("clear")