fix(cache): clean up lib

[MasterPtato]

Description

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Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

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Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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[MasterPtato]

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• chore: envoy client #4521 : 2 dependent PRs (#4531 , #4534 )
• feat(pb): actors v3 #4463
• feat(ups): implement queue subs #4486
• feat(cache): add in flight deduping #4459
• fix(cache): clean up lib #4457 👈 (View in Graphite)
• fix(config): allow configuring topo dcs via map, fix pg ssl mode config #4456
• fix(api): dont 500 on cross dc response #4449
• chore: update byte units on frontend #4444
• fix: runner alloc idx logic, api auth for actor get #4443
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

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commit: e65f84d

[claude]

Review: fix(cache): clean up lib

Positive changes

• Removing the double-serialization roundtrip (Value -> JSON -> Vec<u8>) simplifies the encoder/decoder path and eliminates an extra allocation per write.
• Moving purge metrics to RequestConfig::purge_local rather than the driver layer is correct separation of concerns.
• Renaming fetch_values/set_values/delete_keys to get/set/delete improves readability.
• Removing the Redis stub todo!() arm eliminates a footgun.
• Capacity bump 1,000 to 10,000: likely intentional, but a brief comment explaining the rationale would help future readers.

Issues

Broken integration tests (main blocker)

engine/packages/cache/tests/integration.rs references APIs removed by this PR:

• CacheInner::new_in_memory() uses the old three-argument signature; the service_name: String argument was removed.
• cache.fetch_one() / cache.fetch_all() throughout the test file -- removed and replaced with fetch_one_json / fetch_all_json / fetch_all_json_with_keys.
• cache.rate_limit(), RateLimitConfig, and RateLimitBucketConfig -- referenced in rate-limit tests but removed from the public API.

These tests will not compile. They must be updated or removed before merging.

Unused Cargo.toml dependencies

• rivet-env is no longer used in src/ after removing service_name. Remove from [dependencies].
• futures-util is only used in tests/integration.rs. Move from [dependencies] to [dev-dependencies].

Minor: Deref<Target = String> on RawCacheKey

This exposes the full mutable String API on a newtype meant to carry already-escaped keys. Prefer Deref<Target = str> or AsRef<str> + Borrow<str> to narrow the surface. Soft concern -- the current approach is a common Rust pattern.

Summary

Directionally correct and improves the codebase. The main blocker is broken integration tests that reference removed APIs.