recordUsageHit static method
Record a successful resolution of category (relaxer, proxy,
coercion, or ctor) for base with typeArg. No-op unless
usageLogEnabled; call sites still guard the flag to avoid key allocation
when logging is off.
Implementation
static void recordUsageHit(String category, String base, String typeArg) {
if (!usageLogEnabled) return;
final key = _usageKey(category, base, typeArg);
_usageHits[key] = (_usageHits[key] ?? 0) + 1;
}