feat: x/council — Token-gated collective execution module

[trevormil]

Summary

• New x/council module for token-gated collective execution of arbitrary sdk.Msg
• Membership defined by x/tokenization credential token ownership — no manual member management
• Vote weight = credential token balance
• Full lifecycle: create council → propose messages → vote → execute after delay
• Derived council account addresses for message execution
• Replaces the 5% of x/group (deprecated) that derivatives can't handle

Key features

• Re-voting support (subtracts old weight, adds new)
• Configurable voting threshold (% of total credential supply)
• Execution delay (time-lock after vote passes)
• Optional msg type restrictions per council
• 12 unit tests with mock keepers

Backlog

Implements autopilot backlog #0157

Test plan

• Create council successfully
• Propose with/without credential
• Vote with credential, weight = balance
• Vote without credential (rejected)
• Vote reaches threshold → status = passed
• Execute before delay → rejected
• Execute after delay → success
• Execute wrong status → rejected
• Disallowed msg type → rejected
• Re-vote updates weights correctly
• Integration test with real x/tokenization keeper
• Wire into app.go and test on local testnet

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