build(desktop): goal services adapter test uses removed SessionChangedEvent field

[liuxiaocs7]

What happened

Running the Desktop build from the current main branch fails during build:main. The new Goal services adapter test constructs three SessionChangedEvent fixtures with a type: 'sessions_changed' property, but that property is no longer part of the shared interface.

Expected behavior: npm run build succeeds and test fixtures conform to the current SessionChangedEvent contract.

How to reproduce

1. Check out commit e6e0c34c7 or the current main branch.

2. Install dependencies from the repository root.

3. Run:

   npm --workspace @maka/desktop run build:main

4. TypeScript reports TS2353 at lines 64, 70, and 76 of apps/desktop/src/main/__tests__/goal-services-adapter.test.ts.

Environment

• Maka commit: e6e0c34c7
• OS: macOS 15.7.3, Apple Silicon
• Surface: Desktop
• Node.js: 24.14.0
• npm: 11.19.0

Logs, screenshots, or additional context

src/main/__tests__/goal-services-adapter.test.ts(64,7): error TS2353:
Object literal may only specify known properties, and 'type' does not exist in type 'SessionChangedEvent'.

src/main/__tests__/goal-services-adapter.test.ts(70,7): error TS2353:
Object literal may only specify known properties, and 'type' does not exist in type 'SessionChangedEvent'.

src/main/__tests__/goal-services-adapter.test.ts(76,7): error TS2353:
Object literal may only specify known properties, and 'type' does not exist in type 'SessionChangedEvent'.

PR #3613 removed the unused event discriminator from SessionChangedEvent. PR #3531 subsequently introduced the adapter test from a stale event shape. Open PR #3639 independently records this current-main failure as a blocker to full Desktop typechecking.

The minimal fix is to remove the three stale type properties from the test fixtures.

[liuxiaocs7]

solved by #3642