Add operator troubleshooting runbook

README.md

@@ -63,6 +63,8 @@ versions, SHA-256 fingerprints for every input and exported artifact, and
 normalized dimensions for every input view.
 Downloaded runs can be checked with `python validate_manifest.py
 path/to/*_run.json`; the validator reports missing or tampered artifacts.
+See [TROUBLESHOOTING.md](TROUBLESHOOTING.md) for the scheduler, smoke-test, and
+browser-versus-server failure decision tree.
 Fusion metrics also report the number of distinct dominant source views in the
 fused result, making view collapse visible without overstating provenance.
 They report the fraction of voxels supported by multiple views as a separate