feat: agenta bank — CLI banking commands

[PancheI]

Summary

Add agenta bank command group for Monerium banking integration.

Commands

Command	Description	Mode
bank status	Connection status, IBAN, BIC	Read (CLI)
bank connect	OAuth connect via browser	Browser handoff
bank link	Link wallet via dashboard passkey	Browser handoff
bank orders	List recent transactions	Read (CLI)
bank withdraw -a 100 --iban DE89... --name "Acme"	Withdraw to bank	Browser handoff (pre-fills dashboard form)
bank disconnect	Remove banking connection	CLI with confirmation

Design

• Namespace: Top-level agenta bank (org-level, not under sub)
• Auth: Existing JWT session from agenta login
• Connect: Same pattern as agenta login — open browser, poll status
• Link & Withdraw: Open dashboard — WebAuthn PRF is browser-only
• MCP: Two read-only tools (bank_status, bank_orders) for AI agents

Tasks

• BANK-01: Scaffold command group
• BANK-02: Shared helpers (requireBankSession, bankGet, bankPost)
• BANK-03: bank status
• BANK-04: bank connect (with availability check)
• BANK-05: bank link (browser handoff)
• BANK-06: bank orders
• BANK-07: bank withdraw (browser handoff with pre-filled params)
• BANK-08: bank disconnect
• BANK-09: Platform — accept ?action=withdraw query params in dashboard
• BANK-10: Extract openBrowser() to shared lib
• BANK-11: MCP tools (read-only)

Depends on

Platform PR: feature/monerium-banking-mvp (merged or deployed to sandbox)

Full implementation plan: implementation/TASKS-cli-banking.md