SEP-2575 gives a modern request that needs an undeclared capability its
own error, -32021 MissingRequiredClientCapability with
data.requiredCapabilities; -32601 there claims the method does not
exist. The strict fixture now throws MissingRequiredClientCapabilityError
on the modern leg and keeps -32601 on legacy, which has no such code.
The negative-control test now asserts the code and data per era, and a
new integration test resolves both checked-in strict configs through
loadConfig/resolveConfig, so a misspelled key or a dropped mapping
fails instead of leaving the manual fixtures permissive.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Q3RsrgCxVoFPokLB4vAkxi
Signed-off-by: cliffhall <cliff@futurescale.com>
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