eval(inference): expand warm-tier PromQL pattern coverage

[zzylol]

Summary

• Expands asap-query-engine/examples/promql/inference_config.yaml (and the SQL twin) from a single entry per metric to cover multi-quantile, wider ranges, rate / increase, sum / count over time, spatial aggregations, and top-K. Each entry binds a (metric, PromQL pattern) → (agg_id, plan) tuple consumed by find_query_config's exact-string match.
• Adds asap-query-engine/tests/inference_yaml_pattern_coverage.rs (10 tests) pinning the YAML → find_query_config → parse_and_match_promql → query_statistic routing for every new family with synthetic ingest, asserting non-empty / correct-shape vector results.
• Closes ASAPCollector PROGRESS.md follow-up #4 ("Inference config breadth").

Pre/post coverage

YAML	Pre	Post
examples/promql/inference_config.yaml	1 entry	33 entries (4 spatial-quantile φ, 12 quantile_over_time φ × range, 6 sum_over_time / count_over_time × range, 5 rate / increase × range, 3 spatial aggregations, 3 topk(N, ...))
examples/sql/inference_config.yaml	1 entry	8 entries (4 multi-quantile φ + sum/count/avg over wider windows)

Per-pattern wiring confirmation

YAML pattern	Routes to	Backing accumulator	Notes
quantile_over_time(φ, m[r])	Statistic::Quantile	DDSketchAccumulator, DatasketchesKLLAccumulator	Quantile is the canonical warm-tier path; works on KLL + DDSketch
sum_over_time(m[r])	Statistic::Sum	DDSketchAccumulator, SumAccumulator, CountSketchAccumulator, CountMinSketchAccumulator	SumAccumulator is the simplest backing; sketches answer with no-key totals
count_over_time(m[r])	Statistic::Count	DDSketchAccumulator, SumAccumulator, HllSketchAccumulator (HLL aliases Count → Cardinality)
rate(m[r]) / increase(m[r])	Statistic::Rate / Statistic::Increase	IncreaseAccumulator, MultipleIncreaseAccumulator	KLL has no delta — pair these with Increase-typed streaming aggregations
count(m)	Statistic::Count	same as above; HLL gives unique-cardinality
sum(m) / avg(m)	Statistic::Sum / (Sum, Count)	SumAccumulator / DDSketchAccumulator
quantile by (lbl) (φ, m)	Statistic::Quantile (spatial)	DatasketchesKLLAccumulator
topk(N, m)	Statistic::Topk	CountSketchAccumulator (row-mean total when no key supplied)

Patterns deliberately NOT added (would require code changes)

• histogram_quantile(φ, ...). Not in controller_patterns — parse_and_match_promql only recognises quantile_over_time for the temporal-quantile shape and sum / count / avg / quantile / min / max / topk for the spatial shape. histogram_quantile queries reach the warm tier today only via the controller's stage-split path (which decomposes them into rate(...) precompute jobs); listing histogram_quantile(...) in the inference YAML would silently fail-to-match against incoming canonical-AST strings.
• Per-key topk(N, ...) over CountSketch. The query_statistic no-key fallback returns row-mean total volume, not enumerated heavy-hitters. Per-key enumeration needs a paired SetAggregator / DeltaSetAggregator on the agent (already tracked as a follow-up in PROGRESS.md).

Open question

The task references backend-inference.yaml by that exact filename. That file does NOT live in this repo — it's a deployment-side overlay at ASAPCollector/deploy/configs/backend-inference{,-cms,-hll,-kll,-cs}.yaml, which the asap/query-backend:dev image volume-mounts into the container. The canonical schema source for the inference YAML format is the examples/promql/inference_config.yaml template in this repo (consumed via read_inference_config → InferenceConfig::from_yaml_file), which this PR expands. A separate PR against ASAPCollector will mirror the same pattern families into the per-sketch deployment overlays.

Test plan

• cargo test --release -p query_engine_rust --test inference_yaml_pattern_coverage — 10/10 pass.
• cargo test --release -p query_engine_rust capability_matching — 5/5 pass (no regression to capability-fallback path).
• cargo test --release -p query_engine_rust structural_matching — 5/5 pass (no regression to AST-canonical match path).
• cargo test --release -p query_engine_rust file_io::tests::test_read_inference_config — passes (YAML schema unchanged).
• cargo clippy --release -p query_engine_rust --tests clean for the new test file (5 pre-existing -D warnings errors in engines/simple_engine.rs and count_sketch_accumulator.rs are unrelated to this PR's domain — not touched per file-domain constraints).