* test(conformance): repository-state conformance suite (#262)

Check go-libfossil against draft-fossil-repo-state-00, requirement by requirement. Each derived-state case is a scripted sequence of artifacts loaded into go-libfossil and into fossil(1); the tables derived from it are compared row by row, joined by artifact hash. Every case runs through manifest.Crosslink, as one sweep and one artifact at a time, and most also run as a ".rebuild" case through verify.Rebuild. fossil's rows must equal each expectation on every run, and each case states what ignoring its requirement would change, so a case cannot pass or fail by accident.

API cases cover name resolution, leaves, the ambiguity test, branch creation and listing, and tagging, each compared with fossil's answer on the same repository. TestRepoStateCorpus compares verify.Rebuild and a Crosslink sweep with fossil rebuild on real repositories named by CONFORMANCE_REPOS.

Known failures are marked with the placeholder Gap #0 until their issues are filed, so TestCoverage refuses them for now.

* test(conformance): repository-state suite review fixes (#262)

- Unsorted T-card cases use a non-hex name, so the ordering rule, not the hex-name rule, is what rejects them. - RS-4.2-7 crosslinks every artifact a second time over the rows the first left (repostate.4.2.relink-unchanged), instead of a sweep that links nothing. - RS-7.3-2, -3 and -4 are checked through manifest.Checkin and branch.Create, which maintain leaves one check-in at a time; a crosslink sweep recomputes the whole table. - retag-branch is built so the retagged check-in's own leaf status changes; branch membership is read through BranchLeaves, and the tagxref case it replaced is reattributed to RS-5.4-5; bad-prefix also compares tagxref. - parentless-untagged follows the draft and marks go-libfossil's crosslink, which follows fossil(1), as a deviation; the unused draft field becomes fossil, checked against fossil's rows. - Every fossil(1) command, in all suites, runs with HOME, FOSSIL_HOME and XDG_CONFIG_HOME in the test's directory, so it no longer records checkouts in the user's global configuration.

* test(conformance): mark repository-state gaps with their issues (#262)

Replace the placeholder gap marks with the issues that track each fix: #278 and #285-#294. check-in: 7fa0b9b5da user: [email protected] tags: trunk