Fix: OpenCode event ingestion compatibility (fixes hanging "working..." state with OpenCode Adapter)

[eersnington]

Heya, I started using T3 code 2 days ago with the Openchud integration and I was quite surprised at it not working at all. I've forked T3 code to fix a lot of issues and I'm using the local build for now, but this change would make OpenCode adapter from currently unusable to slightly above usable.

What Changed

• use/global/event from Opencood for runtime event ingestion and filter wrapped events by session directory
• ignore malformed global event payloads before provider event projection
• fall back to legacy /event subscription when global events are unavailable (a lot of chaps within the issue thread below downgraded to <=0.14.40, so this fix would make it work for older sessions too)

Why

Fixes #2644

UI Changes

(sound on 👁️👃👁️🦻)

t3code.pr.1.mp4

Checklist

• [yep] This PR is small and focused
• [sí] I explained what changed and why
• [oui oui] I included before/after screenshots for any UI changes
• [ya po my Chile hombre] I included a video for animation/interaction changes

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Note

Medium Risk
Changes OpenCode session event ingestion to prefer a new global event stream and adds fallback logic, which can affect turn completion and session lifecycle behavior if event formats or error detection differ across OpenCode versions.

Overview
Switches the OpenCode adapter’s event pump to prefer global.event (wrapped events) and projects provider runtime events only after filtering by session directory and validating the wrapped payload shape.

Adds compatibility fallback: if global.event is unavailable (e.g. 404 / TypeError), the adapter falls back to event.subscribe (now called with { directory }). Updates tests to cover global ingestion, directory filtering, malformed payload handling, and the fallback path.

^{Reviewed by Cursor Bugbot for commit bd4ac1a. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix hanging "waiting..." state in OpenCode adapter by preferring global.event stream over legacy event.subscribe

• The event pump in OpenCodeAdapter.ts now first attempts to stream events from a global.event endpoint, filtering by context.directory to ignore events from other sessions and skipping malformed payloads.
• Falls back to the legacy event.subscribe path (passing { directory } as a parameter) when global.event returns a 404 or a TypeError indicating the method is absent.
• Both paths use a session-scoped AbortController that is cancelled on scope close.
• Test coverage in OpenCodeAdapter.test.ts adds four new cases covering global events, directory filtering, malformed payload tolerance, and legacy fallback.

^{Macroscope summarized bd4ac1a.}

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[eersnington]

This PR might seem like a duplicate of #2673, and it kind of is, but 2673 removes the old event stream which would break and regress T3 code experience for users on Opencode versions that are lesser than <=0.14.40 (which relatively recent)

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR modifies runtime event ingestion behavior by introducing a new global event API with fallback to legacy subscription. While well-tested with comprehensive coverage, changes to event processing pipelines that affect session state tracking warrant human review.

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