feat: deployment-aware agentic risk amplification scoring

[arunSunnyKVS]

What & why

Findings today carry a static severity label (low/high/critical) that never changes with the deployment, plus a cosmetic per-evaluator "Avg Score" that averages judge scores — and averaging hides breaches (9 9 2 → 6.7 reads healthy while one attack got through).

This adds a deployment-aware per-evaluator risk score (0–10): the severity label is a floor, amplified by the target's agentic power, so the same flaw scores higher on an autonomous, tool-rich, multi-tenant agent than on a read-only chatbot. Follows the OWASP AIVSS amplification model, reduced to something fully automatic.

Closes #200. Follow-ups: #201 (LLM profile enrichment), #202 (headline integration), #203 (MCP tools/list signal).

How it works

amplifiedRisk(severity, isFinding, power) — base + (10 - base) * power, with CVSS/AIVSS band floors (critical 9.0, high 7.0, medium 4.0, low 1.0). Worst-case at the evaluator level: a finding scores from its floor, a defended evaluator scores 0.0. Averaging is deliberately avoided.

deriveAgentProfile() — a deterministic, no-LLM heuristic that infers the power profile (autonomy / tools / identity / persistence, each 0/0.5/1.0) from businessUseCase + target metadata already in the config. No new setup questions.

Worked example (customer-support): base high = 7.0, inferred power 0.875 → 7.0 + (10-7.0)*0.875 = 9.6. A "high" BOLA on a money-moving, multi-tenant agent surfaces as 9.6; defended evaluators show green 0.0. A caption under the table explains, in plain English, why findings were amplified.

Scope / safety

• The headline Safety Score and summary shape are untouched — feeding amplified risk into the headline is deliberately deferred to Risk scoring: integrate amplified risk into the headline Safety Score #202 (it changes existing score semantics + the equivalence test's exact-shape assertion).
• risk is additive optional metadata; runs without a profile (e.g. direct buildUnifiedReport in tests) simply carry no risk.

Testing

• New unit tests: core/tests/amplify.test.ts, core/tests/agentProfile.test.ts.
• Existing orchestrator-equivalence + smoke tests pass unchanged (182 total, 0 fail).
• npm run build + npm run typecheck green; verified the rendered report end-to-end (BOLA(high,FAIL)→9.6, passes→0.0, summary shape intact).

Files

• core/src/execute/amplify.ts (new) — pure risk function
• core/src/execute/agentProfile.ts (new) — heuristic profile deriver
• core/src/execute/{aggregate,runAll,runAllBrowser,types}.ts — wire + thread the profile
• core/src/report/{types,buildReport,render}.ts — "Base Sev" + "Risk (this agent)" columns
• README.md — Risk scoring section

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added deployment-aware risk scoring from 0–10 for evaluation findings.
  • Risk scores now reflect the target agent’s capabilities, business context, and metadata.
  • Updated results tables to show “Risk (this agent)” with explanatory context and color indicators.
  • Added agent power details and rationale to generated reports.
  • Documented the new risk-scoring approach in the README.

• Tests

  • Added coverage for agent profiling and risk amplification, including severity levels, rounding, and score limits.

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