Bridge Coach memory brief with project metrics summaries.

Add Performance Summary block to memory brief, document metrics synthesis in
agent-coach, and add e2e and CLI tests for qualitative plus quantitative briefs.

src/kaizen_agentic/cli.py

@@ -11,7 +11,7 @@ from typing import List, Optional
 
 from .registry import AgentRegistry, AgentCategory
 from .installer import AgentInstaller, ProjectInitializer, InstallationConfig
-from .metrics import MetricsStore, OptimizerStore
+from .metrics import MetricsStore, OptimizerStore, performance_summary_markdown
 from .optimization import OptimizationLoop, MIN_SAMPLES_FOR_RECOMMENDATIONS
 
 
@@ -892,12 +892,21 @@ def memory_brief(agent_name: str, target: str, raw: bool):
     click.echo(f"Sources: {', '.join(sources) if sources else 'none'}")
     click.echo()
 
-    if not sources:
+    metrics_store = MetricsStore(project_root, agent_name)
+    metrics_summary = metrics_store.read_summary()
+    if metrics_summary is None and metrics_store.executions_path.exists():
+        metrics_summary = metrics_store.write_summary()
+
+    if not sources and not metrics_summary:
         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
 
+    performance_block = performance_summary_markdown(metrics_summary or {})
+    if performance_block:
+        click.echo(performance_block)
+
     # Own memory section
     if own_memory:
         click.echo("### Your Memory")