chore(deps): upgrade cipherstash-client to 0.38.0, drop vendored stack-auth patch (CIP-3233)

[freshtonic]

Summary

Moves Proxy off the vendor/stack-auth [patch.crates-io] workaround and onto the current released cipherstash-client group, built against the fixed stack-auth. This is the CIP-3233 follow-up cleanup.

Background: 2.2.4 (#408) shipped the CIP-3233 access-key token-refresh fix via a vendored stack-auth, patched on top of the 0.34.1-alpha.4 source that cipherstash-client 0.34.1-alpha.4 pinned. cipherstash-client 0.38.0 links stack-auth 0.38.0, which carries the same fix straight from crates.io — so the vendored copy and the patch are no longer needed.

Changes

• cipherstash-client / cipherstash-config / cts-common: 0.34.1-alpha.4 → 0.38.0 (the current published group). The API migration for the 0.34 → 0.37 jump is carried over from the (closed) feat: upgrade cipherstash-client to 0.37.0 #406 0.37.0 upgrade — same 10 source-file changes; 0.37 → 0.38 needed no further source changes.
• Removed [patch.crates-io] stack-auth = { path = "vendor/stack-auth" }, the exclude = ["vendor/stack-auth"] workspace entry, and the entire vendor/stack-auth/ tree.
• stack-auth now resolves from crates.io at 0.38.0 (registry source, verified in the lock). Single version of the whole cipherstash-client group; zerokms-protocol at 0.12.19.

Verification

• cargo check --workspace — clean
• cargo clippy --workspace --all-targets — clean
• cargo test --workspace --lib — 111 cipherstash-proxy unit tests pass
• Lock contains exactly one stack-auth (0.38.0, registry source); no vendor/ or patch.crates-io references remain

Not run: cipherstash-proxy-integration tests (need a live Postgres + ZeroKMS; they fail here only with ConnectionRefused). Please run the full integration suite in CI / with creds before merge.

Notes

• No behaviour change — the token fix already shipped in 2.2.4; this is dependency hygiene, so no version bump / changelog entry. Happy to add one if you'd prefer.
• Supersedes the closed feat: upgrade cipherstash-client to 0.37.0 #406 (which targeted 0.37.0 and predated the vendor patch) and the stale deps: upgrade cipherstash-client to 0.35.0 and EQL to 2.3.0 #394 (0.35.0).

Closes the cipherstash/proxy follow-up line item on CIP-3233.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e8fe116e-1404-4569-bd67-26c9e3e22fdf

📥 Commits

Reviewing files that changed from the base of the PR and between 4facf29 and 2e11f69.

⛔ Files ignored due to path filters (2)

• Cargo.lock is excluded by !**/*.lock
• vendor/stack-auth/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (33)

• Cargo.toml
• packages/cipherstash-proxy/src/error.rs
• packages/cipherstash-proxy/src/lib.rs
• packages/cipherstash-proxy/src/postgresql/backend.rs
• packages/cipherstash-proxy/src/postgresql/context/mod.rs
• packages/cipherstash-proxy/src/postgresql/frontend.rs
• packages/cipherstash-proxy/src/postgresql/messages/bind.rs
• packages/cipherstash-proxy/src/postgresql/messages/data_row.rs
• packages/cipherstash-proxy/src/proxy/encrypt_config/manager.rs
• packages/cipherstash-proxy/src/proxy/mod.rs
• packages/cipherstash-proxy/src/proxy/zerokms/zerokms.rs
• vendor/stack-auth/.gitignore
• vendor/stack-auth/Cargo.toml
• vendor/stack-auth/LICENSE
• vendor/stack-auth/README.md
• vendor/stack-auth/examples/auto_strategy.rs
• vendor/stack-auth/examples/device_code.rs
• vendor/stack-auth/src/access_key.rs
• vendor/stack-auth/src/access_key_refresher.rs
• vendor/stack-auth/src/access_key_strategy.rs
• vendor/stack-auth/src/auto_refresh.rs
• vendor/stack-auth/src/auto_strategy.rs
• vendor/stack-auth/src/device_client.rs
• vendor/stack-auth/src/device_code/mod.rs
• vendor/stack-auth/src/device_code/protocol.rs
• vendor/stack-auth/src/device_code/tests.rs
• vendor/stack-auth/src/lib.rs
• vendor/stack-auth/src/oauth_refresher.rs
• vendor/stack-auth/src/oauth_strategy.rs
• vendor/stack-auth/src/refresher.rs
• vendor/stack-auth/src/service_token.rs
• vendor/stack-auth/src/static_token_strategy.rs
• vendor/stack-auth/src/token.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch james/cip-3233-proxy-drop-vendor-patch

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