Fix OpenCode event session routing

[samjandris]

Summary

• switch OpenCode runtime events from the now-empty /event stream to /global/event
• unwrap global event payloads for the active session directory before using the existing provider event projection
• add regression coverage that the adapter uses the global event stream and handles wrapped OpenCode message events

Fixes #2633

Replaces #2634, which was closed while still pointing at the old fork branch name.

Test plan

• bun fmt
• bun lint
• bun typecheck
• bun run --cwd apps/server test src/provider/Layers/OpenCodeAdapter.test.ts

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Note

^{Cursor Bugbot is generating a summary for commit f4137b5. Configure here.}

Note

Fix OpenCode event session routing by filtering global events by directory

• Switches the event subscription in OpenCodeAdapter.ts from client.event.subscribe to client.global.event, which emits events for all directories.
• Adds directory-based filtering so only events whose directory matches the session's working directory are forwarded to the event handler.
• Updates the OpenCodeSubscribedEvent type alias to extract the payload field from global events, resolving to never for events without a payload.
• Test doubles in OpenCodeAdapter.test.ts are updated to simulate long-lived, abortable global event streams and assert directory-scoped filtering behavior.
• Behavioral Change: event.subscribe is no longer used; the adapter now receives all directory events globally and filters client-side.

^{Macroscope summarized f4137b5.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR changes the event subscription model from session-scoped (event.subscribe) to global events (global.event) with directory-based filtering. While well-tested, this is a significant runtime behavior change that affects how all OpenCode sessions receive events and warrants human verification.

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