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/session-lifecycle-log.ts

@@ -2,7 +2,7 @@
  * @fileoverview Append-only JSONL audit log for session lifecycle events.
  *
  * Records every session creation, start, exit, deletion, recovery, and server
- * start/stop to ~/.claudeman/session-lifecycle.jsonl. Survives server restarts
+ * start/stop to ~/.codeman/session-lifecycle.jsonl. Survives server restarts
  * (unlike RunSummary which is in-memory only).
  *
  * @module session-lifecycle-log
@@ -22,7 +22,7 @@ export class SessionLifecycleLog {
   private writeQueue: Promise<void> = Promise.resolve();
 
   constructor(filePath?: string) {
-    this.filePath = filePath || join(homedir(), '.claudeman', 'session-lifecycle.jsonl');
+    this.filePath = filePath || join(homedir(), '.codeman', 'session-lifecycle.jsonl');
     const dir = dirname(this.filePath);
     if (!existsSync(dir)) {
       mkdirSync(dir, { recursive: true, mode: 0o700 });