rustperf evidence benches

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Each harness writes JSONL under EVIDENCE_DIR (default: the package evidence/ directory). Build with rustc -C opt-level=3, run from this directory.

• evidence_rs001.rs — regenerates ../../evidence/rs-alloc-hot.jsonl
  • Env: RS001_* size knobs, RS001_OPT, RS001_RUSTC
• evidence_rs002.rs — regenerates ../../evidence/rs-string-plus-in-loop.jsonl
  • Build: rustc -C opt-level=3 evidence_rs002.rs -o out/evidence_rs002
  • Run: EVIDENCE_DIR=../../evidence ./out/evidence_rs002
  • Env: RS002_N_PLUS, RS002_N_CHUNK, RS002_N_FMT, RS002_N_SMALL, RS002_SMALL_REPS, RS002_OPT, RS002_RUSTC, EVIDENCE_TS, EVIDENCE_DIR
  • The format! pair is also recorded as ../../evidence/rs-format-rebind-hot.jsonl (aliased, same timings)
• evidence_rs003_rs005_rs006.rs — regenerates the JSONL for rs-println-hot, rs-vec-no-capacity, and rs-collect-vec-hot
  • Env: RS003_N, RS005_*, RS006_* size knobs

Protocol: warm=3, median of 9, Instant wall clock, black_box.