feat: integrate governance event logging across all actions (closes #184)

[onahiOMOTI]

Closes #184

Changes

• Integrated governance_events.rs emits into core governance functions
• Added events for:
  • Proposal creation
  • Vote casting
  • Proposal queuing
  • Proposal execution
  • Proposal cancellation
• Added cancel_proposal function (with event) if not already present
• All events are now emitted at the correct moment with proper indexing

Why

• Makes governance fully observable
• Enables frontend real-time updates (new proposal, votes, execution, etc.)
• Meets acceptance criteria: events emitted correctly & indexed for frontend

Testing

• Tested locally: created proposal → emitted ProposalCreated
• Voted → emitted VoteCast
• Queued/executed/canceled → correct events appear
• Verified topics include "gov" + action + actor

Ready for review/merge — governance is now event-complete.

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[onahiOMOTI]

cargo test passes