## Summary
- Add Sentry tracing around metadata GraphQL cache reads with operation
tags and cache-phase attributes.
- Record cache hits on the request path so the response hook skips a
duplicate lookup after an early return.
- Cover the cache-hit, request-miss/response-hit, and allowlist
filtering cases with unit tests.
Before, even a cache hit performed two Redis reads:
```
onRequest → GET → hit → return cached response
onResponse → GET → hit → do nothing
```
GraphQL Yoga still calls onResponse for an early cached response, so
that second lookup was redundant in most cases.
Now
```
onRequest → GET → hit → mark request in WeakSet → return cached response
onResponse → request marked → remove marker → return immediately
```
onResponse cache mechanism is also there to prevent race conditions
like:
```
Did another request populate this key while I was executing?
yes → keep it
no → cache my response
```
Weiko
26227eff31