PM-tok, PRODUCTION-MATRIX.md:285. `tokenUrl` names a token SERVICE a host points at
instead of pasting a key: the element asks that URL when it was handed no token. Only
ProfileLoader ever read it. A pane composite bakes its children in rather than mounting
them through ProfileLoader, so a composite embedded BARE -- one tag on a partner's page,
which is the entire point of a composite -- dropped a tokenUrl-only config on the floor.
It worked in every place anyone looked, because a ProfileLoader elsewhere on the page
fetched and published the token: the composite was passing an exam somebody else sat.
And the failure wears the wrong face. No token is "No Mapbox access token provided",
0 tiles, no canvas -- identical to a missing `tk`, which IS threaded -- so the natural
reading is that the host mistyped their config rather than that a knob is unread.
The rule lives in library/composables, not in each composite, because it has already
been copied once (ProfileLoader.vue:132) and a third and fourth copy is how one of them
later learns to ask ALWAYS -- which a token service billed per call notices before we do.
The pure decision is split into host-token-url.js with NO framework import, because a
fresh worktree has no node_modules and a module importing vue is unloadable by the gate
that proves it right. Same shape as describeGroup keeping countryName injectable.
check-composite-token-url takes its expectation from ProfileLoader -- the contract a
composite REPLACES -- not from the composites it audits, so it cannot pass by
construction; it exercises the decision rather than grepping for it; and it finds its
subjects by a PROPERTY, a production bundle already forwarding `tk: hostToken`, so a
third composite is covered the day it is written. stack-demo has the same shape and is
excluded by its STAGE, not by name, so promoting it pulls it in automatically.
Negative-tested 5 ways. The fifth found a bug in the gate itself: /tokenUrl/ also matches
`tokenUrlX`, so the check meant to notice the contract being renamed could not fail. It
is \btokenUrl\b now. A guard that cannot fail is the one nobody ever finds by reading.
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