Fix OpenCode event session routing

[samjandris]

Summary

• switch OpenCode runtime events from the now-empty /event stream to /global/event
• unwrap global event payloads and ignore events for other directories before projecting provider events
• add regression coverage that the adapter uses the global event stream and handles wrapped OpenCode message events

Fixes #2633

Test plan

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

Note

Fix OpenCode session event routing to use global.event filtered by directory

• Switches startEventPump in OpenCodeAdapter.ts from client.event.subscribe to client.global.event, which provides a single stream of all runtime events.
• Adds per-event filtering by session directory so only events matching the session's context.directory are forwarded to handleSubscribedEvent.
• Updates type aliases to derive OpenCodeGlobalStreamEvent and OpenCodeSubscribedEvent from the global.event source.
• Adds a test double for global.event in OpenCodeAdapter.test.ts and throws on any call to event.subscribe to enforce the new routing.
• Behavioral Change: events from other directories or without a valid payload (with type and properties) are now silently dropped.

^{Macroscope summarized fb8297c.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

Changes event routing logic from session-specific subscription to global event stream with directory filtering. While the bug fix intent is clear and well-tested, runtime behavior changes to event processing warrant human review, especially given the 'wip' designation in the title.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Dismissing prior approval to re-evaluate fb98a2a

Dismissing prior approval to re-evaluate fb8297c