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-architecture-draft.md

@@ -350,7 +350,7 @@ Agent calls `add_reaction` tool with message ID and emoji. Agent-runner writes m
 { "text": "LGTM" }
 
 // Interactive card
-{ "operation": "ask_question", "question": "Approve deployment?", "options": ["Yes", "No", "Defer"] }
+{ "operation": "ask_question", "title": "Deploy", "question": "Approve deployment?", "options": ["Yes", "No", "Defer"] }
 
 // Edit existing message
 { "operation": "edit", "messageId": "3", "text": "Updated: LGTM with minor comments" }