Implement CAP LS 302 flow with configurable ircv3_caps list, replacing
the minimal SASL-only registration. Parse IRCv3 message tags (@key=value)
with proper value unescaping. Add channel management plugin (kick, ban,
unban, topic, mode) and bot API methods. Add SQLite key-value StateStore
for plugin state persistence with !state inspection command.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Hostmask-based admin controls with automatic IRCOP detection via WHO.
Permission enforcement in the central dispatch path denies restricted
commands to non-admins. Includes !whoami and !admins commands, marks
load/reload/unload as admin-only.
Also lands previously-implemented SASL PLAIN auth, token-bucket rate
limiting, and CTCP VERSION/TIME/PING responses that were staged but
uncommitted.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
