FLX-2102: the recorded plan's own planDigest has moved

Family: plan/replay binding (the 2000 band)

The plan.json read back from the run directory does not hash to the planDigest it was written with -- it was edited, truncated, or written by an incompatible version after the fact. A plan is a fixed point once written; re-run fluxsim plan to produce a fresh one rather than editing this one by hand.

Look it up offline

$ fluxsim explain FLX-2102

Every code is listed in the error index.