docs/VENDORED.txt and actions/docs-sync/docs-sync.sh entered the tree in
the same commit and are byte-identical at every tag — blobs 10c20a3c and
ba426479 at 0.1.0 through 0.5.0 — and 0.1.0's copy of the tool is already
manifest-driven (MANIFEST="docs/VENDORED.txt", L75). Citing 0.5.0 told the
0.1.0-0.4.1 tail, which is exactly the population this section is written
for, that the manifest was unavailable at its pin, so it would keep the
hardcoded list: #251's failure mode reproduced by the document that exists
to abolish it. The same file already said 0.1.0 at L131-L133.
Also make the guard's tracked-ness skip announce itself. It degrades to
"not asserted" wherever the tree is not a git work tree root, and doing
that in silence is the shape this script's own header argues against, so
the skip now prints on both output paths, green and red, with a test row
each way.
Round 1: claude blocking point, and claude nit 3.
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