fix(mcp): map validation and conflict orchestration errors to 400/409… #17055

Job	Run time
Detect Version	4s
Test and Build / Test and Build	4m 22s
Check Docs Changes	0s
Build ARM64 (GHCR Only)	-1s
Build Dev ECR	-1s
Migrate Dev DB	0s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	5m 6s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	56s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	47s
Create GHCR Manifests	0s
Process Docs	0s
Create GitHub Release	0s
	11m 13s

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