fix: harden startup and schema repair contracts

Reliability patch covering startup path resolution, install marker compatibility, export CLI request contracts, schema repair safety, hard-stop retry-loop handling, and the PR babysit status helper.

src/cli/hook-command.ts

@@ -43,6 +43,14 @@ export function isWorkerUnavailableError(error: unknown): boolean {
   return false;
 }
 
+export function isNonBlockingHookInputError(error: unknown): boolean {
+  const message = error instanceof Error ? error.message : String(error);
+  const lower = message.toLowerCase();
+
+  return lower.includes('transcript path') &&
+    (lower.includes('missing') || lower.includes('does not exist'));
+}
+
 async function executeHookPipeline(
   adapter: ReturnType<typeof getPlatformAdapter>,
   handler: ReturnType<typeof getEventHandler>,
@@ -81,6 +89,14 @@ export async function hookCommand(platform: string, event: string, options: Hook
       }
       return HOOK_EXIT_CODES.SUCCESS;
     }
+    if (isNonBlockingHookInputError(error)) {
+      logger.warn('HOOK', `Hook input unavailable, skipping hook: ${error instanceof Error ? error.message : error}`);
+      console.log(JSON.stringify({ continue: true, suppressOutput: true }));
+      if (!options.skipExit) {
+        process.exit(HOOK_EXIT_CODES.SUCCESS);
+      }
+      return HOOK_EXIT_CODES.SUCCESS;
+    }
     if (isWorkerUnavailableError(error)) {
       logger.warn('HOOK', `Worker unavailable, skipping hook: ${error instanceof Error ? error.message : error}`);
       if (!options.skipExit) {