test: bump recursion_limit on 7 CRUD test files for SURREAL_TEST_KV=lance compat

[AdaWorldAPI]

Summary

Mechanical follow-up to #1's Sprint O: adds #[recursion_limit = "1024"] to 7 more CRUD test files so the upstream integration suite can be exercised against the kv-lance backend via SURREAL_TEST_KV=lance.

Why

When both kv-lance and kv-mem features are enabled (the combination is needed because helpers.rs::new_ds() routes through SURREAL_TEST_KV=lance from #1, and upstream iam/file.rs requires tempfile which is gated to kv-mem), the async-trait expansion in surrealdb_core::expr::expression::Expr::compute exceeds rustc's default recursion limit of 128.

Same pattern, same fix:

error: queries overflow the depth limit!
  help: consider increasing the recursion limit by adding a
        `#[recursion_limit = "256"]` attribute to your crate
  note: query depth increased by 130 when computing layout of
        {async fn body of surrealdb_core::expr::expression::Expr::compute()}

Files

7 inner attributes added:

File	Position
surrealdb/core/tests/select.rs	before mod helpers;
surrealdb/core/tests/update.rs	after #[allow(clippy::unwrap_used)]
surrealdb/core/tests/delete.rs	after #[allow(clippy::unwrap_used)]
surrealdb/core/tests/insert.rs	after #[allow(clippy::unwrap_used)]
surrealdb/core/tests/upsert.rs	after #[allow(clippy::unwrap_used)]
surrealdb/core/tests/merge.rs	before mod helpers;
surrealdb/core/tests/relate.rs	before mod helpers;

Value matches tests/create.rs (1024, set in #1's Sprint O).

Cost

Zero runtime cost. Pure compile-time directive; only loosens a default limit.

Test plan

• CI default test run unchanged (no feature change).
• CI/local run of SURREAL_TEST_KV=lance cargo test --features "kv-lance kv-mem" --no-default-features --test update (and select/delete/insert/upsert/merge/relate) compiles without recursion errors. Pass-rate signal feeds the next sprint's KNOWN_DIFFERENCES.md update.

What's NOT covered

• Behavioral pass/fail on the test bodies themselves — that's the Meta phase, will be summarized as a follow-up comment on this PR once the runs complete.
• The other 23 tests/*.rs files (access, alter, asyncevent, auth_limit, cache, changefeeds, complex, define, field, function, future, index, info, live, param, query, remove, script, sequence, table, timeout, util, ...) — they may or may not hit the recursion limit; addressed incrementally.

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Generated by Claude Code

[AdaWorldAPI]

Meta-S verification (post-merge follow-up)

SURREAL_TEST_KV=lance cargo test --features "kv-lance kv-mem" --no-default-features --test update
→ test result: ok. 2 passed; 0 failed; finished in 36.45s

Combined upstream integration coverage under SURREAL_TEST_KV=lance after this PR:

Test file	Pass	Source
tests/create.rs	3/3	Sprint O (#1)
tests/update.rs	2/2	this PR (Sprint S)

The remaining 5 files this PR enables (select, delete, insert, upsert, merge, relate) are queued for verification in a separate sprint along with the ~17 other tests/*.rs files. Each carries a small (~30-90s) per-test-binary cost because Lance creates real datasets on disk per #[tokio::test].

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Generated by Claude Code