SC-022: Implement on-chain event architecture and indexing standard

[Adedoyinjr]

Summary

Implements SC-022 by introducing a canonical, versioned on-chain event architecture for TruthBounty protocol indexers.

Changes

• Added ITruthBountyEvents as the canonical event interface
• Added explicit V1 event names to avoid conflicts with legacy contract events
• Added indexed identifiers, timestamps, and schema version fields
• Integrated canonical events into:
  • TruthBountyWeighted
  • VerifierSlashing
  • RewardEngine
  • GovernanceController
  • TruthBounty
  • BootstrapController
  • MigrationManager
• Added event architecture, indexing, ordering, consumer, schema, and gas benchmark documentation
• Added event harness and focused event tests
• Preserved existing legacy events for backward compatibility

Validation

• npm run compile passes
• Focused validation result: 45 passing, 1 failing
• The remaining failure is the existing minStakeAmount token-supply validation test in TruthBountyWeighted.test.ts, unrelated to the event architecture changes

Indexer Compatibility

• Canonical events use explicit V1 names
• Event payloads include schema version and block timestamp
• High-value identifiers are indexed
• Existing legacy event ABI remains available

Closes #302

[Adedoyinjr]

Hi maintainers, the implementation for SC-022 is ready for review. The required GitHub Actions workflows are currently awaiting maintainer approval because this PR comes from a fork. Please approve the workflows when convenient. Thank you.

[dDevAhmed]

resolve conflicts @Adedoyinjr