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>

package.json

@@ -1,12 +1,12 @@
 {
-  "name": "claudeman",
+  "name": "codeman",
   "version": "0.1650",
   "description": "The missing control plane for Claude Code - run 20 autonomous agents with real-time monitoring and session persistence",
   "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "bin": {
-    "claudeman": "./dist/index.js"
+    "codeman": "./dist/index.js"
   },
   "scripts": {
     "postinstall": "node scripts/postinstall.js",
@@ -71,12 +71,12 @@
   },
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/Ark0N/claudeman.git"
+    "url": "git+https://github.com/Ark0N/Codeman.git"
   },
   "bugs": {
-    "url": "https://github.com/Ark0N/claudeman/issues"
+    "url": "https://github.com/Ark0N/Codeman/issues"
   },
-  "homepage": "https://github.com/Ark0N/claudeman#readme",
+  "homepage": "https://github.com/Ark0N/Codeman#readme",
   "files": [
     "dist",
     "scripts/postinstall.js",