docs(agents): regenerate AGENTS.md hierarchy with init-deep

- Root: preserve 3 CRITICAL sections (PR target, OpenCode source, English-only)
- Update all 10 AGENTS.md files with current codebase analysis
- Add complexity hotspots, agent models, anti-patterns
- Sync line counts and structure with actual implementation

src/features/AGENTS.md

@@ -30,7 +30,8 @@ features/
 ├── tmux-subagent/              # Tmux session management
 ├── mcp-oauth/                  # MCP OAuth handling
 ├── sisyphus-swarm/             # Swarm coordination
-└── sisyphus-tasks/             # Task tracking
+├── sisyphus-tasks/             # Task tracking
+└── claude-tasks/               # Task schema/storage - see AGENTS.md
 ```
 
 ## LOADER PRIORITY