fix: return valid MCP elicitation actions for Codex approvals

[zackleman]

Summary

• Fix Codex approvals failing with MCP error -32602 by returning a valid elicitation result (action: accept|decline|cancel).
• Map Happy permission decisions (approved/denied/abort) to MCP actions so mobile approvals work reliably.

[ffflyZzz]

Hi @zleman1593 👋

 Thanks for the fix — this looks solid and addresses a real issue we’re seeing with Codex approvals failing due to MCP error -32602.

Returning explicit MCP elicitation actions (accept | decline | cancel) and mapping Happy permission decisions to MCP actions makes sense, and should significantly improve reliability, especially for mobile approvals.

From what I can see:
✅ Clear problem statement and scope
✅ Logic aligns with MCP expectations
✅ No conflicts with main, clean merge
✅ Single, focused commit

Since this unblocks Codex approval flows and there are no pending checks, it would be great to get this merged when you have a moment.
Thanks again for the contribution!