fix: delegate OpenCode session titles to provider

[tris203]

What Changed

• Stop sending a generated title when creating OpenCode sessions
• Emit thread metadata updates from OpenCode session title events
• Cover the title sync flow in adapter tests

This means that when a thread in opencode is created it created without a title, opencode generates the title and this is recieved by t3code

Why

Native opencode never recived the t3code title. This made it a bit disorientating when switching between t3code and the native app

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes

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Note

Low Risk
Localized OpenCode adapter behavior around display titles and event mapping; no auth, persistence, or security-sensitive paths change.

Overview
OpenCode sessions are no longer created with a T3-generated title on session.create; only permission rules are sent so OpenCode owns title generation, matching the native app.

When OpenCode emits session.updated with a non-empty title, the adapter now maps that to thread.metadata.updated (payload.name plus metadata.sessionID). Session filtering for subscribed events also resolves the session id from either properties.sessionID or properties.info.id (needed for session.updated).

Adapter tests assert create payloads omit title and that title events surface as thread metadata updates.

^{Reviewed by Cursor Bugbot for commit 4bee25b. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Delegate session title generation to OpenCode provider

• Removes the title field from the session.create payload so OpenCode owns title generation instead of the caller.
• Adds a session.updated event handler in makeOpenCodeAdapter that extracts the title from the event and emits a thread.metadata.updated runtime event.
• Adds openCodeEventSessionId to also accept session IDs from properties.info.id, in addition to properties.sessionID.

^{Macroscope summarized 4bee25b.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

Changes how session titles are generated, shifting from hardcoded client-side titles to provider-delegated titles via event streaming. This affects user-observable behavior (thread naming) and introduces new event handling logic, warranting human review.

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