Add a VoteDeclined event to ProposalEvent

[geffrak]

Ticket: https://splitsecure.monday.com/boards/8107294006/pulses/13126852513

Problem

A device can now decline a threshold proposal. The server records the decline as its own proposal event, so that a decline never counts toward the threshold. ProposalEvent has no event for it, so the server carries the message in a local copy of this file.

Fix

Add VoteDeclined { vote_bottle = 1; voter_enclave_id = 2; } to ProposalEvent, at oneof tag 11. It has the same shape as VoteReceived. Additive.

Validation

buf lint clean. buf breaking against main clean. Go and TS regenerated.

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Sep 24, 2026, 3:28 PM

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📥 Commits

Reviewing files that changed from the base of the PR and between 039ca33 and 4888066.

⛔ Files ignored due to path filters (2)

• gen/es/proto/splitsecure/proposals/v1/events_pb.ts is excluded by !**/gen/**, !gen/**
• gen/go/proto/splitsecure/proposals/v1/events.pb.go is excluded by !**/*.pb.go, !**/gen/**, !gen/**

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• proto/splitsecure/proposals/v1/events.proto

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🔇 Additional comments (1)

proto/splitsecure/proposals/v1/events.proto (1)

22-22: LGTM!

Also applies to: 39-45

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Walkthrough

The proposal event oneof adds a vote-decline variant. Its nested message contains a vote bottle and voter enclave ID. Comments state that a decline does not count toward the threshold and that its bottle contains no share material.

Changes

Vote decline event

Layer / File(s)	Summary
Add the vote-decline event contract proto/splitsecure/proposals/v1/events.proto	Adds vote_declined as oneof field 11 and defines VoteDeclined with vote_bottle and voter_enclave_id fields. Comments describe the decline event and its bottle.
Estimated code review effort: 1 (Trivial)	~3 minutes

Merge Risk: ⚪ Minimal · up to 48880

This change adds a vote-decline event type and generated bindings. No concrete merge-blocking issue is established by the repository evidence.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a VoteDeclined event to ProposalEvent.
Description check	✅ Passed	The description explains the problem, the schema change, the event behavior, and validation results. It is directly related to the changeset.
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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