Every leg installed a release tag and updated to HEAD, so nothing ran
HEAD's installer on an empty machine (where all four 2026-09-23
install.ps1 breaks lived) and nothing exercised the updater we ship
today -- tag legs run the OLD build's updater handing off to HEAD.
The generator appends a HEAD -> NEXT start after the sampled tags, so the
column runs wherever the update legs run (dispatch and stable-release).
NEXT is a reserved update ref: the drivers mint a child of the install
commit that adds one marker file, written to the object store only, which
the local bare clone carries into serve.git.
On Windows the HEAD leg takes every git.exe dir off PATH and installs no
remote get-url shim: Get-PinnedGit returns any git on PATH, so either one
skipped pinned-git staging. launch-from-spec's HEAD observer now uses the
driver's real git so it cannot poll '' forever on that leg.
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