Refactor cockpit to use DockerTmuxController pattern

Based on claude-code-tools TmuxCLIController, this refactor:

- Added DockerTmuxController class for robust tmux session management
- Implements send_keys() with configurable delay_enter
- Implements capture_pane() for output retrieval
- Implements wait_for_prompt() for pattern-based completion detection
- Implements wait_for_idle() for content-hash-based idle detection
- Implements wait_for_shell_prompt() for shell prompt detection

Also includes workflow improvements:
- Pre-task git snapshot before agent execution
- Post-task commit protocol in agent guidelines

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/__init__.py

@@ -0,0 +1,18 @@
+# Luzia Orchestrator Library
+from .docker_bridge import DockerBridge, cleanup_idle_containers, list_project_containers
+from .sub_agent_context import (
+    SubAgentContext,
+    SubAgentContextManager,
+    FlowPhase,
+)
+from .sub_agent_flow_integration import SubAgentFlowIntegrator
+
+__all__ = [
+    'DockerBridge',
+    'cleanup_idle_containers',
+    'list_project_containers',
+    'SubAgentContext',
+    'SubAgentContextManager',
+    'FlowPhase',
+    'SubAgentFlowIntegrator',
+]