sync: endpoint_fingerprint now includes security_schemes, security_required,
tags, and operation_id — catches changes that previously went undetected.
Method comparison uppercased for consistency. New details field in
SyncOutput carries full ChangeDetails alongside the summary. Removed
unused _skipped_from_resume binding. normalize_to_json callers updated
for new (bytes, Value) return type. allow_private_host forwarded to
sync --all HTTP client builder.
fetch: content hash now computed from post-resolution json_bytes instead
of raw_bytes — when --resolve-external-refs is used, the stored content
differs from the original fetch, so the hash must match what is actually
written to the cache.
diff: --fail-on=breaking check moved before any output to avoid the
contradictory pattern of emitting success JSON then returning an error
exit code. Robot mode now emits a proper robot_error envelope on
breaking-change failure.
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