docs(bench): unify rollout/shot terminology + honestly scope the HumanEval gate

[drewstone]

"Shot" was overloaded. The canon (HARNESS.md, roadmap-rsi.md) already has the right unit: a rollout = one agent running an AgentProfile to completion — a full, possibly multi-turn/stateful trajectory; k counts rollouts, turns live inside one. The HumanEval gate, though, used "shot" for a raw stateless single completion that bypasses AgentProfile/the runtime — exactly the equal-k-on-stateless-samples the harness explicitly warns against.

• HARNESS.md — adds a one-word Terminology block: rollout ≡ shot = one AgentProfile run; a stateless completion (maxTurns=0, harness:null) is the degenerate case; names humaneval-gate.mts as the no-self-correction selector LOWER BOUND, distinct from the rollout-based keystone gate.
• humaneval-gate.mts — a SCOPE note in the header + a runtime regime banner: its numbers isolate the selector with the generator unable to self-correct (the selector's maximum leverage), so a win is the science (the selector works in a deployable-checker regime), not the product. Bridge = run the same arms as real rollouts (AgentProfile through runLoop, dialing maxTurns).

No code-path change; docs + comments + one log line. Merges clean.

🤖 Generated with Claude Code

[tangletools]

✅ No Blockers — 5f41aa3f

Readiness 95/100 · Confidence 70/100 · 0 findings (none)

	deepseek	glm	aggregate
Readiness	95	95	95
Confidence	70	70	70
Correctness	95	95	95
Security	95	95	95
Testing	95	95	95
Architecture	95	95	95

Full multi-shot audit completed 2/2 planned shots over 2 changed files. Global verifier still owns final merge decision. | Full multi-shot audit completed 2/2 planned shots over 2 changed files. Global verifier still owns final merge decision.

No findings.

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_{tangletools · 2026-06-05T22:30:21Z · trace}

[tangletools]

✅ Clean — 5f41aa3f

Full multi-shot audit completed 2/2 planned shots over 2 changed files. Global verifier still owns final merge decision. | Full multi-shot audit completed 2/2 planned shots over 2 changed files. Global verifier still owns final merge decision.

Full immutable report for this review: trace

Summary comment for this run: full summary

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_{tangletools · 2026-06-05T22:30:21Z · immutable trace}