fix: stale hook detection checks wrong directory path

gsd-check-update.js looked for hooks in configDir/hooks/ (e.g.,
~/.claude/hooks/) but the installer writes hooks to
configDir/get-shit-done/hooks/. This mismatch caused false stale
hook warnings that persisted even after updating.

Also clears the update cache during install so the next session
re-evaluates hook versions with the correct path.

Closes #1249

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bin/install.js

@@ -3900,6 +3900,11 @@ function install(isGlobal, runtime = 'claude') {
     }
   }
 
+  // Clear stale update cache so next session re-evaluates hook versions
+  // targetDir is e.g. ~/.claude/get-shit-done/, parent is the config dir
+  const updateCacheFile = path.join(path.dirname(targetDir), 'cache', 'gsd-update-check.json');
+  try { fs.unlinkSync(updateCacheFile); } catch (e) { /* cache may not exist yet */ }
+
   if (failures.length > 0) {
     console.error(`\n  ${yellow}Installation incomplete!${reset} Failed: ${failures.join(', ')}`);
     process.exit(1);