fix(tui): scope attention notifications

[opencode-agent]

Summary

• expose the directory/workspace metadata already supplied by the TUI event adapter in the plugin event-bus type
• ignore question, permission, status, and error events that do not belong to the event session location
• notify for permission and question requests only when they remain pending in TUI state, so auto-approved permissions do not play attention sounds

Why

The server event feed spans locations, while the built-in notification plugin previously consumed matching event names without checking their directory or workspace. Auto-approve mode also replies to permission.asked without adding the request to pending TUI state, but the notification plugin still played staplebops-06 for the transient event.

Testing

• bun test test/cli/cmd/tui --timeout 30000 --only-failures (25 passed)
• bun typecheck in packages/tui
• bun typecheck in packages/plugin
• Prettier check for changed files
• git diff --check

Requested by: @kommander (Sebastian Herrlinger via Slack)