feat: add hermes backend support

- Add myhermes entrypoint and myagents hermes subcommand
- Hermes sessions read from global SQLite store (~/.hermes/state.db)
- Default args: --yolo
- Update README, AGENTS.md, Makefile, pyproject.toml
- Add tests for hermes subcommand, passthrough, and session listing

scripts/rm_user_local_myagents.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
-"""Remove ~/.local/bin/{myagents,myclaude,mykimi,mycodex} symlinks to this repo's venv."""
+"""Remove ~/.local/bin/{myagents,myclaude,mykimi,mycodex,myhermes} symlinks to this repo's venv."""
 
 from __future__ import annotations
 
 import os
 import sys
 
-_COMMANDS = ("myagents", "myclaude", "mykimi", "mycodex")
+_COMMANDS = ("myagents", "myclaude", "mykimi", "mycodex", "myhermes")
 
 
 def _remove_link(link: str, want: str) -> bool: