fix: hook version tracking, stale hook detection, stdin timeout, and session-report command (#1153, #1157, #1161, #1162) (#1163)

* fix: hook version tracking, stale hook detection, and stdin timeout increase

- Add gsd-hook-version header to all hook files for version tracking (#1153)
- Install.js now stamps current version into hooks during installation
- gsd-check-update.js detects stale hooks by comparing version headers
- gsd-statusline.js shows warning when stale hooks are detected
- Increase context monitor stdin timeout from 3s to 10s (#1162)
- Set +x permission on hook files during installation (#1162)

Fixes #1153, #1162, #1161

* feat: add /gsd:session-report command for post-session summary generation

Adds a new command that generates SESSION_REPORT.md with:
- Work performed summary (phases touched, commits, files changed)
- Key outcomes and decisions made
- Active blockers and open items
- Estimated resource usage metrics

Reports are written to .planning/reports/ with date-stamped filenames.

Closes #1157

* test: update expected skill count from 39 to 40 for new session-report command

bin/install.js

@@ -2606,10 +2606,14 @@ function install(isGlobal, runtime = 'claude') {
         if (fs.statSync(srcFile).isFile()) {
           const destFile = path.join(hooksDest, entry);
           // Template .js files to replace '.claude' with runtime-specific config dir
+          // and stamp the current GSD version into the hook version header
           if (entry.endsWith('.js')) {
             let content = fs.readFileSync(srcFile, 'utf8');
             content = content.replace(/'\.claude'/g, configDirReplacement);
+            content = content.replace(/\{\{GSD_VERSION\}\}/g, pkg.version);
             fs.writeFileSync(destFile, content);
+            // Ensure hook files are executable (fixes #1162 — missing +x permission)
+            try { fs.chmodSync(destFile, 0o755); } catch (e) { /* Windows doesn't support chmod */ }
           } else {
             fs.copyFileSync(srcFile, destFile);
           }