The sep-2575-server-rejects-undeclared-capability check required
error.data.requiredCapabilities to be an array containing 'sampling'. The
schema's MissingRequiredClientCapabilityError defines it as a
ClientCapabilities object ({ "sampling": {} }), as do this repo's own
spec-types and the tasks/required-task-error scenario, so a spec-correct
server could not pass the check. It shipped because the positive -32021
branch had no self-test.
- stateless.ts: accept the object shape; each capability value must itself
be an object ({ "sampling": null } fails). State the shape in the
scenario's implementer-facing description.
- examples/servers/typescript/everything-server.ts: emit the object.
- stateless.test.ts: self-tests for object-passes / array-fails /
null-value-fails, sharing one capability-probe mock helper.
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