Connect to multiple IRC servers concurrently from a single config file.
Plugins are loaded once and shared; per-server state is isolated via
separate SQLite databases and per-bot runtime state (bot._pstate).
- Add build_server_configs() for [servers.*] config layout
- Bot.__init__ gains name parameter, _pstate dict for plugin isolation
- cli.py runs multiple bots via asyncio.gather
- 9 stateful plugins migrated from module-level dicts to _ps(bot) pattern
- Backward compatible: legacy [server] config works unchanged
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
4-tier permission model: user < trusted < oper < admin.
Commands specify a required tier via tier= parameter.
Backward compatible: admin=True maps to tier="admin".
- TIERS constant and Handler.tier field in plugin.py
- _get_tier() method in bot.py with pattern matching
- _is_admin() preserved as thin wrapper
- operators/trusted config lists in config.py
- whoami shows tier, admins shows all configured tiers
- 32 test cases in test_acl.py
