feat(v2/approvals): per-card titles and structured options

Approval cards now carry a required title (Add MCP Request, Install
Packages Request, Rebuild Request, Credentials Request) and structured
options with distinct pre-click label, post-click selectedLabel (e.g.
"✅ Approved" / "❌ Rejected"), and value used for click routing. The
title and normalized options are persisted in pending_questions so the
post-click card edit can render the correct per-type title and selected
label on both chat-sdk channels and Discord interactions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/v2-api-details.md

@@ -309,8 +309,13 @@ function createWhatsAppChannel(): ChannelAdapter {
 {
   "operation": "ask_question",
   "questionId": "q-123",
+  "title": "Failing Test",
   "question": "How should we handle the failing test?",
-  "options": ["Skip it", "Fix and retry", "Abort deployment"]
+  "options": [
+    "Skip it",
+    { "label": "Fix and retry", "selectedLabel": "✅ Fixing", "value": "fix" },
+    { "label": "Abort deployment", "selectedLabel": "❌ Aborted", "value": "abort" }
+  ]
 }
 ```