feat(event): governance action created

[wolf31o2]

Closes #484

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Summary by cubic

Adds full governance action extraction and serialization to ProposalProcedure events. Clients now receive detailed Conway governance data, including action specifics and parameter updates.

• New Features
  • Added GovActionData and helpers to support Info, NoConfidence, HardForkInitiation, TreasuryWithdrawal, UpdateCommittee, NewConstitution, and ParameterChange actions.
  • Populates actionData in ProposalProcedureData via extractGovActionData, with hex/string encoding for IDs, hashes, and addresses.
  • Mapped ProtocolParameterUpdate fields, ExUnits, ExecutionCosts, and voting thresholds; added rationalToFloat for cbor.Rat.
  • Added unit tests for action extraction, GovActionId conversion, and rational conversions.

^{Written for commit 131c310. Summary will update on new commits.}

Summary by CodeRabbit

• New Features

  • Enhanced governance proposal handling with richer, typed representations for actions (treasury withdrawals, committee updates, new constitution, protocol parameter changes, hard-fork initiation, no-confidence, info).
  • Improved extraction and presentation of protocol parameters, execution costs, voting thresholds, and related numeric values for clearer proposal details.

• Tests

  • Added unit tests validating governance action parsing and numeric conversions (including edge cases).

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[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a typed union for governance actions and numerous concrete action payload structs (Info, NoConfidence, HardForkInitiation, TreasuryWithdrawal, UpdateCommittee, NewConstitution, ParameterChange, and related nested types such as ProtocolParameterUpdateData, ExUnitsData, ExecutionCosts, and voting thresholds). Extends ProposalProcedureData with an ActionData field. Implements extractors to convert internal GovAction representations into the new public structs (including helpers for protocol parameter conversion and rational-to-float conversion). Adds unit tests covering GovAction extraction, GovActionId handling, and rational conversion.

Possibly related PRs

• feat: governance event type #578: Modifies event/governance.go and the governance data model; introduces GovernanceEvent/ProposalProcedureData changes that are directly related to adding GovActionData and extraction logic.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: adding governance action data extraction and serialization to event handling.
Linked Issues check	✅ Passed	Issue #484 title indicates this PR addresses governance action creation requirements; the implementation adds comprehensive governance action data extraction, serialization, and type definitions as expected.
Out of Scope Changes check	✅ Passed	All changes are directly related to governance action data extraction: new types for action variants, extraction helpers, integration with ProposalProcedureData, and supporting tests.

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✨ Finishing touches

• 📝 Generate docstrings

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[cubic-dev-ai]

No issues found across 2 files

[wolf31o2]

@coderabbitai full review

[coderabbitai]

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[wolf31o2]

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[coderabbitai]

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