fix: improve UX for stale manifest cache, list rerun hints, and version info (#805)

- Show warning when manifest is loaded from stale cache (offline fallback)
  so users know the data may be outdated
- Fix list footer rerun command: reuse buildRetryCommand instead of
  truncating prompts with "..." which produced broken copy-paste commands
- Show manifest cache age in "spawn version" output for troubleshooting
- Bump CLI version to 0.2.67

Agent: ux-engineer

Co-authored-by: A <6723574+louisgv@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cli/src/commands.ts

@@ -8,6 +8,7 @@ import {
   cloudKeys,
   matrixStatus,
   countImplemented,
+  isStaleCache,
   RAW_BASE,
   REPO,
   type Manifest,
@@ -45,7 +46,11 @@ async function withSpinner<T>(msg: string, fn: () => Promise<T>, doneMsg?: strin
 }
 
 export async function loadManifestWithSpinner(): Promise<Manifest> {
-  return withSpinner("Loading manifest...", loadManifest);
+  const manifest = await withSpinner("Loading manifest...", loadManifest);
+  if (isStaleCache()) {
+    p.log.warn("Using cached manifest (offline). Data may be outdated.");
+  }
+  return manifest;
 }
 
 function validateNonEmptyString(value: string, fieldName: string, helpCommand: string): void {