C Split\sthe\supdate\sread-path\sdiagnostics\sapart\sfrom\sthe\scorruption\sclaim\n\nzit\supdate,\sopen,\smerge\sand\sbisect\scollapsed\sApplyError.StateRecordInvalid\sand\nApplyError.Corrupt\sonto\sone\sline,\s"cannot\sread\srepository:\srepository\sis\ncorrupt".\sThey\sare\sdifferent\sclaims.\sCorrupt\smeans\sstored\sbytes\sdo\snot\smatch\nthe\sname\sthey\sare\sstored\sunder.\sStateRecordInvalid\smeans\sonly\sthat\sa\sstored\nartifact\swas\snot\susable\sas\sa\scheck-in\sstate\srecord,\swhich\ssays\snothing\sabout\nintegrity.\n\nAn\sintact\sfossil\sclone\sreaches\sthe\ssecond\sroutinely:\sfossil\sstores\sand\ssyncs\nartifacts\sit\sdeclines\sto\scrosslink\sitself.\sAssembly\streats\sthose\sas\sfatal\nwhile\sthe\sread\sverbs\sskip\sthem,\sso\supdate\saccused\san\sundamaged\sclone\sof\ncorruption\swhile\stimeline\sread\sthe\ssame\sstore\sfine.\n\nStateRecordInvalid\snow\scarries\sits\sown\sreason\stext,\sshared\sacross\sthe\sfour\nverbs\sso\sthey\scannot\sdrift\sor\sre-merge.\sThe\sbisect\smapper\shad\sa\sblanket\nelse\sarm\sswallowing\sthe\swhole\sset\sinto\sthat\scorruption\sline;\sit\sis\snow\nexhaustive\sover\sApplyError.\n\nDiagnostics\sonly:\sassembly\sstill\srejects\sthese\sartifacts,\sso\supdate\sstill\nexits\s1\son\ssuch\sa\sclone.\sThe\stolerance\sfix\sis\sseparate;\sthe\sshape\sthat\ntriggers\sit,\san\sanonymous\swiki\spage\swith\sno\sU\scard,\sis\spinned.\n 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