feat: cross-platform support with Node.js scripts

- Rewrite all bash hooks to Node.js for Windows/macOS/Linux compatibility
- Add package manager auto-detection (npm, pnpm, yarn, bun)
- Add scripts/lib/ with cross-platform utilities
- Add /setup-pm command for package manager configuration
- Add comprehensive test suite (62 tests)

Co-authored-by: zerx-lab

scripts/hooks/session-end.js

@@ -0,0 +1,82 @@
+#!/usr/bin/env node
+/**
+ * Stop Hook (Session End) - Persist learnings when session ends
+ *
+ * Cross-platform (Windows, macOS, Linux)
+ *
+ * Runs when Claude session ends. Creates/updates session log file
+ * with timestamp for continuity tracking.
+ */
+
+const path = require('path');
+const fs = require('fs');
+const {
+  getSessionsDir,
+  getDateString,
+  getTimeString,
+  ensureDir,
+  readFile,
+  writeFile,
+  replaceInFile,
+  log
+} = require('../lib/utils');
+
+async function main() {
+  const sessionsDir = getSessionsDir();
+  const today = getDateString();
+  const sessionFile = path.join(sessionsDir, `${today}-session.tmp`);
+
+  ensureDir(sessionsDir);
+
+  const currentTime = getTimeString();
+
+  // If session file exists for today, update the end time
+  if (fs.existsSync(sessionFile)) {
+    const success = replaceInFile(
+      sessionFile,
+      /\*\*Last Updated:\*\*.*/,
+      `**Last Updated:** ${currentTime}`
+    );
+
+    if (success) {
+      log(`[SessionEnd] Updated session file: ${sessionFile}`);
+    }
+  } else {
+    // Create new session file with template
+    const template = `# Session: ${today}
+**Date:** ${today}
+**Started:** ${currentTime}
+**Last Updated:** ${currentTime}
+
+---
+
+## Current State
+
+[Session context goes here]
+
+### Completed
+- [ ]
+
+### In Progress
+- [ ]
+
+### Notes for Next Session
+-
+
+### Context to Load
+\`\`\`
+[relevant files]
+\`\`\`
+`;
+
+    writeFile(sessionFile, template);
+    log(`[SessionEnd] Created session file: ${sessionFile}`);
+  }
+
+  process.exit(0);
+}
+
+main().catch(err => {
+  console.error('[SessionEnd] Error:', err.message);
+  process.exit(0);
+});