WP-0001 complete: v1.1.0 lazy registry and install performance

Lazy-load agent registry (frontmatter index, parse on demand), copy
agents by path during install, fix Makefile template tab lint issue,
add registry performance tests, bump to 1.1.0, document CLI reinstall
after pull.

tests/test_registry.py

@@ -53,9 +53,9 @@ description: Second test agent
 
     registry = AgentRegistry(tmp_path)
 
-    assert len(registry._agents) == 2
-    assert "agent-one" in registry._agents
-    assert "agent-two" in registry._agents
+    assert registry.agent_names() == ["agent-one", "agent-two"]
+    assert registry.get_agent("agent-one") is not None
+    assert registry.get_agent("agent-two") is not None
 
 
 def test_agent_registry_get_agent(tmp_path):