refactor(config): use cachedInvalidateWithTTL, bump effect to beta.37

[kitlangton]

Summary

• Replace mutable let cachedGlobal + reassignment pattern with Effect.cachedInvalidateWithTTL(effect, Duration.infinity) — uses the built-in invalidation effect instead of re-creating the cache on every invalidate call
• Add Effect.tapError to log when global config loading fails before falling back to empty defaults (previously silent)
• Bump effect and @effect/platform-node from 4.0.0-beta.35 → 4.0.0-beta.37

Details

The old pattern used a let binding that was reassigned in invalidate():

let cachedGlobal = yield* Effect.cached(loadGlobal().pipe(...))
// in invalidate():
cachedGlobal = yield* Effect.cached(loadGlobal().pipe(...))

The new pattern uses the idiomatic Effect primitive:

const [cachedGlobal, invalidateGlobal] = yield* Effect.cachedInvalidateWithTTL(
  loadGlobal().pipe(...),
  Duration.infinity,
)
// in invalidate():
yield* invalidateGlobal

Test plan

• 127 config tests pass
• 1526 total tests pass (full suite, 0 failures)
• Typecheck clean