The five are NOT one shape, and treating them as one would have changed what
readers see. Measured before touching them:
ApproxPinNote, FilterDropdown fall back to a literal map
SemanticTreeLegend, PosterWall fall back to humanizeKey() — 'legend.columns.name' renders 'Name'
PinHint falls back to a one-key map
SemanticTreeLegend, PinHint also capture i18n.te (used 3x and 1x)
PosterWall also captures i18n.locale
So useOptionalT grew an optional `fallback` hook, and useOptionalI18n was added
for the callers that need te and locale. Every site passes the fallback it
already had, so not one rendered string changes. Routing them through the
catalogue instead would have altered what seven bare-host bundles print, and —
because tStatic honours the runtime locale — would have started translating
strings that are English today. That may be an improvement; it is not this
commit's to make. Changing a default is not a migration.
te keeps its existing contract too: FALSE on a bare host, never "true because the
catalogue has it". PinHint and SemanticTreeLegend both record why — te is how
their callers know to use their own defaults.
THE CHECK NOW LIVES ON MAIN, which is the point of this commit as much as the
migration is. dx-shepherd: the 18-assertion version was in _qa-cycle, so it would
never have run again. internal/check-optional-t-equivalence.mjs is registered as
check:optional-t-equivalence — script line, //scripts note and gates:post token,
all inserted by hand rather than by re-serialising package.json. It carries 46
assertions: the helper's contract across all three host states, a branch-for-
branch equivalence against the old hand-written code, and a PER-SITE REGISTER
that every later C4 wave appends a row to. Negative-tested from outside: strip one
site's own fallback and it fails naming that site.
check:library-index went red on the new composable and is green again after
`bun run library-index`. That is the staleness gate working, not a flake.
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