[36] Surface events for health/pause/admin operations

[merlik787-droi]

Problem Statement

Several state-changing operations do not emit events:

• reward-pool::set_pause — toggles global pause; no event.
• reward-pool::initialize — bootstrap; no event.
• course-registry::initialize — same.
• badge-nft::initialize — same.
• stake-vault::initialize — does emit StakeVaultInitialized.
• quest-engine::initialize — same.
• governance::initialize — same.

The asymmetry: half the contracts emit init events, half don't. Off-chain indexers can't reconstruct admin wiring from events alone.

Why It Matters

• Operations and analytics teams use events as the source of truth.
• An event-less init means indexers must poll, missing the moment.

Expected Outcome

• Every initialize() emits a ContractInitialized { admin, role_addresses... } event.
• Every set_pause() emits a PauseToggled { admin, status } event.
• Symmetric PauseToggled for quest-engine::set_pause.

Acceptance Criteria

• New event types defined and emitted.
• Tests assert the events are present.
• Cross-contract indexer documentation updated.

Implementation Notes

• Use consistent naming ContractInitialized, PauseToggled, AdminTransferred across all contracts.

Files / Modules Affected

All six contracts; cross-cutting doc updates.

Dependencies

Issue #20 (two-step admin transfer) ties to this.

Difficulty

Easy.

Estimated Effort

2–3 hours.

Suggested Labels

observability, P2, quality

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[Songu3020]

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

[grantfox-oss]

🦊 GrantFox — @Songu3020 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #36)
2. Your PR will be reviewed by the Kqirox maintainers

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