FLX-2201: run touched a seed-tree path the plan did not anticipate

Family: plan/replay binding (the 2000 band)

Every stream a run draws from is addressed by a path from the closed table in KERNEL-SPEC §3, and the set of paths the run will touch is recorded beside the plan in seed-paths.ndjson, whose digest plan.json carries as seedTreeDigest. A path outside that table, or outside the planned set, means the run is not the run that was planned -- so it stops rather than emitting rows whose provenance the plan cannot account for.

Look it up offline

$ fluxsim explain FLX-2201

Every code is listed in the error index.