P2: Validate adapter event task IDs before persisting

[vamgan]

Problem

runTask() persists adapter events exactly as emitted.

Relevant code:

• src/runtime.ts:189-193
• contract test helper: src/testing.ts:59-66

If an adapter emits an event for a different taskId, the event is stored under that other task while logs are appended under the local task ID.

Impact

A buggy adapter can corrupt another task's event stream or make logs/events inconsistent.

Suggested fix

In RuntimeService, either:

• validate event.taskId === task.id and reject/fail the task, or
• normalize emitted events with { ...event, taskId: task.id } before persistence.

Keep adapter contract tests, but do not rely on adapter tests as the only runtime isolation guard.

Acceptance criteria

• Runtime tests cover an adapter emitting a mismatched task ID.
• No event can be persisted to a different task during a run.