[Contracts] Emit missing events on state-changing functions in agent_registry and escrow

[david87131]

Why this matters

Off-chain indexers cannot track several state changes. agent_registry::complete_transaction flips completed to true and increments completed_agreements but emits no event, and no TransactionCompleted event type exists. In escrow, fund_escrow, the full-release branch of approve_release, and resolve_dispute move funds but emit no event, while only timeout/partial/deduction paths emit. Every fund movement and status change should emit an event.

Acceptance criteria

• complete_transaction emits a new TransactionCompleted event with relevant fields
• escrow emits events on funding, full release, and dispute resolution (refund vs release distinguished)
• Event field naming is consistent with existing events in each contract
• Tests assert the new events are published

Files to touch

• contracts/agent_registry/src/agent.rs
• contracts/agent_registry/src/events.rs
• contracts/escrow/src/escrow_impl.rs
• contracts/escrow/src/events.rs

Out of scope

• Standardizing event topics across all contracts
• Event schema doc

[david87131]

Superseded by the consolidated contract audit issues (#67-#104) which cover the same findings more comprehensively. Closing to avoid duplicate coverage.

[Muhamadmust]

Hi maintainer
I have reviewed this issue and would love to work on it, PR 2 days

[Mystery-CLI]

I have read through the required implementations and understand what to do can i work on it?

[grantfox-oss]

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

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #96)
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