C Merge\sblockers:\s`zit\stag\sadd\sNAME\sCHECKIN`\smints\sa\sSINGLETON\ssym\scard\s(B6)\n\nLands\sthe\sB6\sincrement\s(d8e5e811)\son\strunk.\sThe\sfix\sitself\sis\sunchanged\sfrom\nthat\scommit\sand\sits\sfull\sreasoning\sis\srecorded\sthere;\sthis\smessage\scovers\sthe\nlanding,\sbecause\sthe\smerge\swas\snot\sa\sformality.\n\nWHAT\sB6\sFIXES\n\n`tag`\swas\sread-only.\s`tag\slist`\swas\sthe\sonly\ssubcommand,\sso\sa\srepository\scould\nnot\sbe\sgiven\sa\sname\sfor\sa\scheck-in\sat\sall.\sUnlike\sthe\sother\sfive\sblockers\sthis\nwas\snot\sa\swrong\sanswer\s—\sthe\sverb\stold\sthe\struth\sabout\swhat\sexisted\s—\sbut\sthe\ncapability\swas\ssimply\sabsent.\s`zit\stag\sadd\sNAME\sCHECKIN`\snow\smints\sone\sCONTROL\nartifact\scarrying\sa\ssingle\s`T\s+sym-NAME`\scard,\stargeting\sthe\sresolved\scheck-in's\s64-hex\nhash.\n\nTHE\sSIGN\sIS\sTHE\sWHOLE\sCORRECTNESS\sARGUMENT\n\nThe\scard\sis\sa\sSINGLETON\s(`+`),\snot\sa\spropagating\s(`*`)\stag.\s`resolveName`\n(src/repostate.zig:891)\spicks\sthe\smax-`event.mtime`\scheck-in\samong\sALL\sactive\n`sym-`\srows,\sso\sa\spropagating\s`*sym-v1`\swould\sbe\sinherited\sby\severy\sdescendant\nand\sthen\sresolve\sto\sthe\sNEWEST\sof\sthem\s—\sthe\sname\swould\ssilently\sdrift\soff\sthe\ncheck-in\sthe\suser\stagged,\swhich\sis\sthe\ssame\sclass\sof\swrong\sanswer\sas\sB1.\n`applyTagOps`\s(src/repostate.zig:727)\sgates\spropagation\son\n`op.type\s!=\s.singleton`,\sso\sa\s`+`\scard\spins\sthe\sname\swith\sZERO\srepostate\nchanges.\sThe\scontrast\swith\sa\sbranch\sis\sdeliberate:\sa\s*branch*\ssym\spropagates\nprecisely\sbecause\sdescendants\smust\sinherit\sit;\sa\s*tag*\ssym\sdoes\snot,\sprecisely\nbecause\sthey\smust\snot.\n\nCONFLICT\sRESOLUTION,\sSTATED\n\nOne\sconflict,\ssrc/e2e.zig,\spositional\srather\sthan\ssemantic:\strunk's\sB5\sblock\sand\nB6's\sblock\sare\sboth\sappended\sat\sthe\send\sof\sthe\sfile\sover\san\sempty\scommon\nancestor.\sFossil\sagain\semitted\sthe\sfive-part\sconflict\srather\sthan\sthe\susual\sfour\n—\sa\s"#######\sSUGGESTED\sCONFLICT\sRESOLUTION\sfollows"\ssection\scarrying\sits\sown\nproposed\smerge\ssits\sbetween\sthe\slocal\scopy\sand\sthe\sancestor\ssection.\sSplitting\nonly\son\sthe\sfour\sfamiliar\smarkers\sswallows\sthat\sseparator\sinto\sthe\skept\stext,\nwhich\sthen\scompiles\sas\sgarbage;\sB3's\slanding\srecorded\sthe\ssame\strap\sand\sit\nrecurred\shere\sverbatim.\n\nThe\stwo\scandidate\ssections\swere\scompared\sbefore\schoosing:\sthe\sSUGGESTED\ssection\nand\sthe\sMERGED\sIN\ssection\sare\sbyte-identical\s(257\slines\seach),\sand\sthe\scommon\nancestor\sis\sa\ssingle\sempty\sline.\sThe\sresolution\skeeps\strunk's\s8\sB5\stests\splus\nexactly\sone\scopy\sof\sB6's\s5-test\sblock.\sVerified\spost-resolution:\sno\sresidual\nmarker\sof\sany\sof\sthe\sfive\skinds,\s432\stests\sin\sthe\sfile,\sno\sduplicated\stest\sname,\nand\sthe\sB3\s(5),\sB5\s(8)\sand\sB6\s(7)\sblocks\sall\spresent\sat\stheir\sexpected\scounts.\nOne\sfurther\sedit\swas\sneeded\s—\sthe\ssplice\sleft\sa\sdoubled\sblank\sline\sat\sthe\sseam,\nwhich\s`zig\sfmt`\sflagged;\sthe\sreformat\sis\sthat\sone\sblank\sline\sand\snothing\selse.\n\nTEST\sEVIDENCE\sON\sTHE\sMERGED\sTREE\n\nRe-verified\son\strunk\safter\sthe\smerge,\snot\sinherited\sfrom\sthe\sbranch:\n`zig\sfmt\s--check\s.`,\s`zig\sbuild`,\s`zig\sbuild\stest`,\s`zig\sbuild\se2e`\s(432/432,\nno\sfiltering),\s`zig\sbuild\sdst`\s(6\sseeds\sx\s1000\ssteps)\sand\s`zig\sbuild\ssmoke`\n(S1-S6)\seach\sexit\s0.\s`fossil\sextras\s--dotfiles`\sis\sempty.\n\nThe\sblocker\srepro\swas\salso\sdriven\sby\shand\sagainst\sthe\srebuilt\smerged\sbinary\nrather\sthan\sinferred\sfrom\sthe\ssource:\s`zit\stag\sadd\sv1\stip`\sexits\s0\sand\sprints\nthe\sartifact\shash;\safter\sa\ssecond\scommit\s`zit\scat\sa.txt\sv1`\sis\sthe\stagged\ncontent\swhile\s`zit\scat\sa.txt\stip`\sis\sthe\snewer\sone,\sand\s`zit\stag\slist\stip`\ndoes\sNOT\scarry\sv1\s—\sthe\ssingleton\spins\sand\sis\snot\sinherited.\s`zit\stag\sadd\sv1`\nalone\sis\sa\susage\serror\sat\sexit\s2,\sand\s`zit\stag\sadd\sv2\snosuchcheckin`\sexits\s1\nnaming\sthe\scheck-in\sand\sleaves\sno\stag\sbehind.\n\nCHANGED\sEXPECTATIONS\s(all\sthree\sencoded\sthe\smissing\scapability,\snothing\selse)\n\ncli\stag\sB-tag-7\s(src/cli.zig)\sand\scli\stag\sB-tag-13\s(src/e2e.zig)\sused\sthe\nliteral\stoken\s`add`\sas\stheir\sstand-in\sfor\s"not\sa\ssubcommand".\s`add`\sIS\sone\snow,\nso\sboth\suse\s`cancel`,\sa\sword\sthat\sstill\sis\snot\s—\scancel/remove\ssemantics\sstay\ndeferred\sto\s0.2.\scli\stag\sB-tag-11's\sverbatim\s`tag_help_expected`\sgains\sthe\s`add`\nusage\sline\sand\sits\sparagraph,\sbecause\s`tag\s--help`\smust\steach\sthe\snew\sgrammar.\nThe\sdiff\swas\saudited\sfor\sother\sexpectation\schanges\sand\sthere\sare\snone.\n\nRECORDED,\sNOT\sASSUMED:\sbranch\screation\sshares\sno\sread-only\sgap.\sIt\sis\salready\nserved\sby\s`commit\s--branch`,\swhich\smints\sthe\spropagating\sbranch/sym\spair\ndirectly\son\sthe\scheck-in\smanifest\s(src/cli.zig\s`composeCommitTags`),\sso\sthere\sis\nno\s`branch\sadd`\sto\swrite.\n\nNo\sborrowed\stechnique:\sthe\ssingleton-sign\sargument\sand\sthe\s`mintControlArtifact`\nextraction\sare\soriginal\sto\sthis\schange.\sNo\sperformance\sclaim\sis\smade.\n
D 2026-07-19T16:36:26.620
F .fossil-settings/ignore-glob 3580f973d7097226f91a27c7b61ec13d9d07880d95549f9b90ce86da5d867a23
F .github/workflows/ci.yml b4e7fde8ffe45298c2775d4f99f5382acba72f69b6e2d9f72d59e71d4531f60f
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F build.zig 43c12a0eaffed3817646b3021862ee1add3b8536a85b531b7cf55319c3b0e95e
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F docs/rfcs/draft-fossil-sync-protocol-00.txt aa55791464a54ef4b651df8780ba5c46e95c723c7997d09a5b727fef658f920a
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F src/rfc_vectors/artifact_a1_2_sha3_technote.txt 832e850f83aab2e2a754aa97591109f7f05fb41e4126c7e71c88a59d6d17e55d
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F src/rfc_vectors/sync_a1_round1_reply.txt 638813029b10f81303b88859279afb17095d7c779c993f4267870909acabbeb9
F src/rfc_vectors/sync_a1_round2_file_cards.txt 4fa397741f7521cc4181d5d6b04dc143187f57602384eaa688552115ecda27c2
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