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/mux-interface.ts

@@ -13,9 +13,9 @@ import type { ProcessStats, PersistedRespawnConfig, NiceConfig, ClaudeMode, Sess
  * Multiplexer session metadata.
  */
 export interface MuxSession {
-  /** Claudeman session ID */
+  /** Codeman session ID */
   sessionId: string;
-  /** Multiplexer session name (e.g., "claudeman-abc12345") */
+  /** Multiplexer session name (e.g., "codeman-abc12345") */
   muxName: string;
   /** Process PID */
   pid: number;
@@ -105,7 +105,7 @@ export interface TerminalMultiplexer extends EventEmitter {
   /** Get all tracked sessions */
   getSessions(): MuxSession[];
 
-  /** Get a session by Claudeman session ID */
+  /** Get a session by Codeman session ID */
   getSession(sessionId: string): MuxSession | undefined;
 
   /** Get all sessions with process resource statistics */