feat: compile recordings automatically after stop

[abrichr]

What changed

• Compile each completed Flow or native recording automatically.
• Keep the raw recording when compilation fails.
• Show compile progress, a clear failure state, and a retry action in Desktop.
• Open the compiled workflow once, even when both the event and command response arrive.

Why

The normal authoring path stopped after capture and required a separate manual compile action. This change completes the record-to-workflow transition while preserving the retained recording and the existing local privacy boundary.

User impact

After an operator stops a recording, Desktop builds the workflow and opens it automatically. If the build fails, Desktop keeps the recording and offers a retry instead of requiring another demonstration.

Checks

• uv run python -m pytest -q tests/test_engine/test_dispatch.py — 62 passed
• npm run test:ui -- src/screens/RecordReview.test.tsx — 1 passed
• npm run build — passed
• uv run ruff check engine/dispatch.py tests/test_engine/test_dispatch.py — passed
• git diff --check origin/main...HEAD — passed

Integration

The change is file-disjoint from Desktop PR #85 and from the loopback authentication lane.