Integration: Matrix client session and send wiring

[mjkatgithub]

Planning

• Milestone: Phase 4
• Priority: P2
• Size: M
• Estimate: 3 SP
• Epic: Epic: Expand integration test suite #128

Goal

Add integration specs that exercise real composable wiring for Matrix
client session + message send, using shared mocks from unit tests but importing
multiple production modules together.

Scope

• Login → useMatrixClient → mock SDK sendEvent round-trip
• Session restore path with useState + stored session fixture
• Reuse matrixClientSpecMocks / matrixClientTestSetup patterns from unit layer
• File: tests/integration/composables/useMatrixClient.session.spec.ts (new)

Branch

feature/integration-matrix-client

Acceptance Criteria

• ≥ 5 integration tests covering login, restore, and send text message
• Tests fail if composable wiring breaks (not only export shape checks)
• npm run test:integration green locally and in CI

Test Checklist

Integration

• npm run test:integration

Unit

• No regression: npm run test:unit

Notes

Docs: update docs/architecture.md test row if new support fixtures added.