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>

scripts/ralph-wizard-demo.mjs

@@ -8,7 +8,7 @@ import { join } from 'node:path';
 import { homedir } from 'node:os';
 
 const BASE_URL = 'https://localhost:3000';
-const CASE_NAME = 'claudeman-ios';
+const CASE_NAME = 'codeman-ios';
 
 async function main() {
   console.log('🎬 Starting Ralph Loop Wizard demo...\n');
@@ -25,7 +25,7 @@ async function main() {
   });
   const page = await context.newPage();
 
-  console.log('📱 Opening Claudeman web UI...');
+  console.log('📱 Opening Codeman web UI...');
   await page.goto(BASE_URL);
   await page.waitForLoadState('networkidle');
 
@@ -41,8 +41,8 @@ async function main() {
   await page.selectOption('#ralphCaseSelect', CASE_NAME);
 
   // Load initprompt.md if it exists
-  const initPromptPath = join(homedir(), 'claudeman-cases', CASE_NAME, 'initprompt.md');
-  let taskDescription = 'Build an awesome iOS app for Claudeman!';
+  const initPromptPath = join(homedir(), 'codeman-cases', CASE_NAME, 'initprompt.md');
+  let taskDescription = 'Build an awesome iOS app for Codeman!';
   if (existsSync(initPromptPath)) {
     taskDescription = readFileSync(initPromptPath, 'utf-8').trim();
     console.log(`📝 Loaded initprompt.md (${taskDescription.length} chars)`);