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Assert-density\spass:\supdate,\sserve,\stransport\n\nRaise\sassert\sdensity\sin\sthe\sthree\sthinnest\slibrary\smodules,\senforcing\ninvariants\sthat\salready\shold.\sAsserts\sonly,\sno\sbehavior\schange.\n\nupdate.zig:\sguard\sthe\scheckout-state\stransition.\sapplyCheckin\sasserts\sthe\ndesired\smanaged\sset\sequals\sthe\starget\splan\smembership\s(validateTopology\sproves\nthe\spaths\sunique);\srequireClean\sasserts\sa\sclean\stree's\splan\smembership\sequals\nthe\srecorded\smanaged\sset;\srecordUndoImage\sasserts\sthe\saffected\sunion\scovers\nboth\soperands;\scommitMaterialization\sself-guards\sthat\sthe\scommitted\srecord\nnames\sexactly\sthe\sstaged\scheck-in\sand\sthat\sthe\smanaged\sset\sis\sits\smembership;\nthe\smerge\spath\sasserts\sone\srollback\spre-image\sper\spath\sand\sa\sshared\spre-merge\nmanaged\sbaseline.\n\nserve.zig:\sa\sservable\srequest\sis\sa\sPOST\sbearing\sa\srequest-valid\scompressed\nmedia\stype\s(§4\sL759-764);\san\saccepted\sbody\shonors\sthe\s§4\sL1148-1149\sceiling;\na\scompressed\sreply\sis\sapplication/x-fossil\s(§4.1);\sthe\saccept\sloop\shonors\sits\nrequest\sbound.\n\ntransport.zig:\sa\sframed\scontainer\scarries\sits\s4-byte\slength\sprefix\s(§4.1);\san\nunframed\sreply\sstays\swithin\sreply_body_cap\s(§4\sr9);\sa\sfollowed\sredirect\slands\nonly\son\san\shttp/https\stransport\s(§4\sr12/r13).\n 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