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ShahriarLak
ea780fed61
The brain-sync stage failed on EVERY Windows run with "is not recognized as an internal or external command", so /sync-gbrain always reported ERR brain-sync among otherwise green stages. #1731 gave these spawns shell: NEEDS_SHELL_ON_WINDOWS. That is correct for the gbrain.cmd shim and does nothing here: shell:true routes through cmd.exe, which resolves .cmd/.bat via PATHEXT but has no concept of a shebang, so an extension-less bash script is rejected outright. A .cmd shim needs a shell; a shebang script needs an interpreter. The two cases look identical and are not. The failure was quiet rather than loud. artifacts_sync_mode defaults to pushing curated artifacts to git, so a Windows user's learnings piled up uncommitted in ~/.gstack indefinitely while the sync report showed one red line out of four. New bashScriptInvocation() resolves Git for Windows' bash explicitly and passes the script as argv[0]. It prefers Git bash over a bare `bash` on PATH because WindowsApps ships a bash.exe that is the WSL launcher, which would read C:\... as a Linux path; GSTACK_BASH overrides for unusual installs; forward slashes because bash treats backslashes as escapes; and it returns null when no bash exists so the stage says so plainly instead of surfacing an unactionable spawn error. The #1731 tripwire asserted the shape that does not work, so it now asserts the opposite (never a raw spawnSync(brainSyncPath, ...)) and six unit tests cover the resolver. Verified on Windows: the stage now reports "OK brain-sync curated artifacts pushed (4.2s)" and the artifacts repo committed + pushed on its own. Affected-test set unchanged at 14 pre-existing failures before and after, with 6 new passing tests.