AGENTS.md@tests/perf git:20260810.5d4699dA

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# Agent Guidelines for Query Performance Tests

- Keep GitHub Actions YAML thin. Put non-trivial control flow, case expansion,
  report generation, and metadata writing in scripts under `.github/scripts/`;
  workflow steps should mostly invoke those scripts.
- Query regression PR runs should build base/candidate binaries once, then run
  the default case set. Do not hard-code a single case such as
  `promql_pushdown_7913` into the workflow path.
- The case DSL is not required to keep compatibility inside this PR. When the
  DSL changes, update TOML cases, the outer lifecycle script, Rust helpers, and
  docs together.
- `[case]` is report metadata only. `[scenario]` is the executable regression
  configuration and must include `kind`, data layout, tables, queries, and
  thresholds. Rust owns case schema, defaults, validation, and normalized plan
  output through `query_perf_fixture plan`. `.github/scripts/query-regression-run.py`
  owns process lifecycle; `query_regression_runner` consumes normalized plans,
  frontend endpoints, direct-SST materialization requests, and OTLP target/finalize
  requests.
- Keep the direct-SST generator generic. Issue-specific behavior belongs in case
  files and thresholds, not in Rust generator logic.
- Before pushing perf harness changes, run at least:
  - the Python tests in the `Test query regression tooling` step of
    `.github/workflows/query-regression.yml`
  - `cargo fmt --all -- --check`
  - `cargo build -p cmd --bin query_perf_fixture --features dev-tools`
  - `cargo build -p cmd --bin query_regression_runner --features dev-tools`
  - exercise the outer lifecycle script and Rust fixture generator against all
    built-in cases when the DSL or workflow case selection changes.