chore: rename Claudeman to Codeman

Full product rename across 109 files (~834 occurrences):
- Env vars: CLAUDEMAN_* → CODEMAN_*
- Data dirs: ~/.claudeman/ → ~/.codeman/, ~/claudeman-cases/ → ~/codeman-cases/
- tmux prefix: claudeman- → codeman-
- localStorage: claudeman-* → codeman-*
- Package/CLI: claudeman → codeman
- GitHub repo: Ark0N/Claudeman → Ark0N/Codeman
- systemd service: claudeman-web → codeman-web
- Class: ClaudemanApp → CodemanApp

Migration infrastructure for seamless transition:
- state-store.ts: auto-migrates data directories on startup
- tmux-manager.ts: dual-prefix detection (legacy claudeman- sessions)
- app.js: localStorage key migration (preserves old keys)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/team-watcher.ts

@@ -2,7 +2,7 @@
  * @fileoverview Agent Teams Watcher
  *
  * Polls ~/.claude/teams/ and ~/.claude/tasks/ for agent team activity.
- * Matches teams to Claudeman sessions via leadSessionId and emits
+ * Matches teams to Codeman sessions via leadSessionId and emits
  * events for UI updates and team-aware idle detection.
  *
  * @module team-watcher
@@ -70,7 +70,7 @@ export class TeamWatcher extends EventEmitter {
     return Array.from(this.teams.values());
   }
 
-  /** Get team associated with a Claudeman session (matched by leadSessionId) */
+  /** Get team associated with a Codeman session (matched by leadSessionId) */
   getTeamForSession(sessionId: string): TeamConfig | undefined {
     const teamName = this.sessionToTeam.get(sessionId);
     if (teamName) {