Add message call metadata

[Adri11334]

Summary

Adds Discord private call metadata to Message so consumers can read the call participant list and optional end timestamp from gateway message payloads.

Changes

• add MessageCall for call.participants and call.ended_timestamp
• expose Message.Call on message payloads
• keep call metadata when partial message updates are merged into state
• cover active calls, ended calls, and state merge behavior in tests

Testing

• go test . -run 'TestMessage_Unmarshal(Call|ActiveCall)|TestState_MessageAddMergesCall' -count=1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1748e6c0-1910-4538-840a-15d3f23e7cbb

📥 Commits

Reviewing files that changed from the base of the PR and between 12a1d26 and 9ad2277.

📒 Files selected for processing (4)

• message.go
• message_call.go
• message_test.go
• state.go

📝 Walkthrough

Walkthrough

Adds a new MessageCall struct with Participants and EndedTimestamp fields to represent private call metadata. The Message struct gains an optional Call *MessageCall field. State.MessageAdd is updated to copy the Call field from incoming messages when non-nil, and three new tests cover unmarshalling and state merge behavior.

Changes

MessageCall Support

Layer / File(s)	Summary
MessageCall type and Message field message_call.go, message.go	MessageCall struct is introduced with Participants []string and EndedTimestamp *time.Time; the Message struct gains a Call *MessageCall field with json:"call,omitempty".
State merge and test coverage state.go, message_test.go	State.MessageAdd conditionally copies Call from the incoming message when non-nil; tests verify JSON unmarshalling of a finished call, an active call with null ended_timestamp, and state merge that preserves author while updating call participants and EndedTimestamp.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and specifically describes the main change: adding message call metadata support to the Message type.
Description check	✅ Passed	The description is directly related to the changeset, detailing the new MessageCall struct, Message.Call field exposure, state merge behavior, and testing approach.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds support for Discord “call” metadata on messages and ensures State.MessageAdd merges call updates into cached messages.

Changes:

• Add Message.Call field and new MessageCall type for call metadata.
• Update State.MessageAdd to merge Call into existing cached messages.
• Add tests covering JSON unmarshalling of call and state merge behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
state.go	Merge the Call field when updating an existing cached message.
message.go	Add Call *MessageCall to the Message struct JSON model.
message_call.go	Introduce MessageCall type to represent call participants and end time.
message_test.go	Add unit tests for call unmarshalling and state merge semantics.

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