Implements the current IndieAuth spec's dedicated /revocation endpoint
so clients can self-revoke a token (e.g. on user sign-out), rather than
only supporting revocation via the admin side. Always responds 200 per
spec, whether the token was found or not, so callers can't use it to
probe token validity. Skips the legacy action=revoke-on-/token fallback
the spec mentions for older clients, since the only real client here is
already being updated to use the current endpoint.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014625MfkGZ7GVdbqKme4a8L
