The old name implied the list was only for by-hand steps, which sat badly
with the fact that most entries in practice are programmatic — the test
suite, `fish_indent`, `docs/verify-manual.py`, CI. Dropping "Manual" lets
one list carry both kinds, and gives the checkbox state real meaning:
- **Checked** — verified, whether it ran programmatically or the author
performed it by hand.
- **Unchecked** — an outstanding manual check the reviewer still has to
perform. Left visible rather than dropped.
- **The list is the merge gate.** A PR isn't merged until every box is
checked; added as an explicit rule under Branching & Pull Requests
alongside the other merge rules.
Because unchecked boxes now block the merge, the guidance also states that
only resolvable checks belong here — one nobody can run would block the PR
indefinitely. Genuinely unverifiable caveats and assumptions go in
`## Notes`, which already existed in the optional-sections list.
Incidentally realigns with PRs 121-122, which had already shortened the
heading to `## Verification`; that part of the recent drift was right.
rootiest
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