the workspace declares an MSRV no crate inherits, so nothing reads it and nothing checks it

[CarlAllenn]

Defect

Cargo.toml:26 declares the workspace MSRV and says, in a comment,
exactly what it is for:

# The MSRV a consumer reads, and the one clippy's `incompatible_msrv`
# checks against: it defaults to this field rather than to a number in
# clippy.toml, so the manifest stays the single source (canon #445).
rust-version = "1.97"

No member inherits it. Every member inherits version, edition,
license, repository, readme, keywords and categories from
[workspace.package]; rust-version.workspace = true is on none of the
four. Cargo's inheritance is opt-in per field, so:

$ cargo metadata --no-deps | jq -r '.packages[] | "\(.name) -> \(.rust_version)"'
lab-core -> null
lab-cli -> null
lab-wasm -> null
lab-pg -> null

Three claims in that comment are false at once. No published crate
carries an MSRV, so no consumer reads one. clippy::incompatible_msrv
has no version to check against, so the lint that comment names as the
reason for the field is silently inert. And lint:msrv (.github#820),
whose whole job is to compile each declared minimum at the rustc that
names it, reports:

lint:msrv: no crate declares rust-version, skipped

That line is the check being honest — it is the fail-closed wording
#820 built precisely so a skip cannot read as a pass. Nobody had read it,
because until .github#813 nothing ran lint:msrv here at all.

Decided build

Add rust-version.workspace = true to all four members, beside the seven
fields they already inherit. Nothing else changes: the value is already
declared once with its reasoning, and this is the line that makes the
declaration reach the crates it describes.

Then re-run mise run lint:msrv and expect it to compile, not skip. The
workspace pins exactly one rustc (1.97.1) and the declared minimum is
1.97, so #820's patch-exact rule is already satisfied — see its
agreement leg, which names both files.

Rejected, recorded: deleting the field instead. The comment's reasoning
is right — the manifest IS the single source clippy reads, and a fixture
that publishes four crates to two registries should say what rustc they
need. What was missing was the inheritance, not the intent.

Canon consequence

None. lint:msrv already reported this correctly and needs no change; it
is a repository that never met it.

Done when

• all four members carry rust-version.workspace = true
• cargo metadata shows 1.97 for each
• mise run lint:msrv compiles a declared minimum instead of skipping,
  and says so in its own output

Sequencing

Independent of #265 and #268 — this is repo-local and blocked by
nothing. Found 2026-08-24 while doing #265: it is the second thing the
belt at .github#813's pin reported the first time it ever looked at this
workspace.