Move monolithic d5-all.json + feature-parity.json + smoke.json into
per-integration directories under d4/<slug>/, d6/<slug>/, and shared/.
Every fixture file is now context-scoped to enable server-side aimock
routing via match.context. Migrated 12 HITL fixtures from main's
d5-all.json additions into shared/_migrated-from-d5-all-hitl.json
for follow-up distribution into per-integration files.
Railway now pulls ghcr.io/copilotkit/aimock:latest directly
via a startCommand that fetches fixtures from GitHub raw URLs.
The wrapper Dockerfile that copied fixtures into the image is
no longer needed.
Also updates README.md to reflect the new architecture:
- References Railway startCommand instead of Dockerfile
- Removes the Dockerfile entry from the fixtures listing
- Updates related workflow descriptions