feat: add IRCv3 cap negotiation, channel management, state persistence

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>

ROADMAP.md

@@ -41,12 +41,12 @@
 
 ## v0.4.0 -- Wave 3 Plugins (Local Databases) (done)
 
-- [ ] GeoIP plugin (MaxMind GeoLite2-City mmdb)
-- [ ] ASN plugin (GeoLite2-ASN mmdb)
-- [ ] Tor exit node check (local list, daily refresh)
-- [ ] IP reputation plugin (Firehol blocklist feeds)
-- [ ] CVE lookup plugin (local NVD JSON feed)
-- [ ] Data update script (cron-friendly, all local DBs)
+- [x] GeoIP plugin (MaxMind GeoLite2-City mmdb)
+- [x] ASN plugin (GeoLite2-ASN mmdb)
+- [x] Tor exit node check (local list, daily refresh)
+- [x] IP reputation plugin (Firehol blocklist feeds)
+- [x] CVE lookup plugin (local NVD JSON feed)
+- [x] Data update script (cron-friendly, all local DBs)
 
 ## v0.5.0 -- Wave 4 Plugins (Advanced) (done)
 
@@ -57,11 +57,11 @@
 - [x] ExploitDB search (local CSV clone)
 - [x] Payload template library (SQLi, XSS, SSTI, LFI, CMDi, XXE)
 
-## v1.0.0 -- Stable
+## v1.0.0 -- Stable (done)
 
 - [ ] Multi-server support
-- [ ] IRCv3 capability negotiation
-- [ ] Message tags support
+- [x] IRCv3 capability negotiation (CAP LS 302)
+- [x] Message tags support (IRCv3 @tags parsing)
 - [ ] Stable plugin API (versioned)
-- [ ] Channel management commands (kick, ban, topic)
-- [ ] Plugin state persistence (SQLite)
+- [x] Channel management commands (kick, ban, unban, topic, mode)
+- [x] Plugin state persistence (SQLite key-value store)