Crosswake.
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Raised by Crosswake.Bridge.push/3 when the requested capability family is not a
member of the bridge's closed vocabulary at all — a different problem from
Crosswake.Bridge.UndeclaredCapabilityError, which fires for a family the bridge DOES
know about that this route's policy simply never declared.
The known vocabulary is defined in two places: Crosswake.Bridge.Contract.commands/0
(the wire command list) and Crosswake.Manifest.Builder.capability_catalog/0 (the
manifest-facing capability catalog). This error's remediation deliberately does NOT
suggest declaring the family on a route — Crosswake.Policy.Validator rejects any
declaration outside the known vocabulary, so that "fix" would turn this click-time
crash into a mount-time crash for every route in the app (D-51).
Defined at the top level for the same reason as Crosswake.Bridge.NotMountedError
and Crosswake.Bridge.UndeclaredCapabilityError above — nesting would double the
module prefix.