feat(humanizer): scenario read-test corpus + runner (SC-4) [skip-docs]

Step 9 of v5.1.0 humanizer Wave 4. Adds tests/scenario-read-test.mjs
runner, tests/scenario-read-test.test.mjs wrapper, and 5 scenario
fixtures in tests/scenarios/ that feed deterministic raw findings
through humanizeFinding and assert the humanized
title/description/recommendation match brief-owner-approved regex
patterns encoding the ground-truth what/why/whatNext answers.

Corpus selection (per brief criteria):

- 01-tok-cascade.json - TOK/CPS category (token efficiency)
- 02-cps-volatile.json - TOK/CPS category (cache prefix stability)
- 03-cnf-conflict.json - CNF category (conflicts)
- 04-gap-no-claude-md.json - GAP category (feature gap)
- 05-set-invalid-json.json - SET category, AND its v5.0.0 title +
  description carry tier1 'invalid' (the brief criterion 'one finding
  whose v5.0.0 description uses a forbidden word').

Runner mechanics:

- Loads scenarios matching ^\\d{2}-[a-z0-9-]+\\.json$ in sorted order.
- Calls humanizeFinding(scannerInput) and matches each humanized field
  against its declared pattern (case-insensitive regex).
- Verifies humanizer-added structural fields (userImpactCategory,
  userActionLanguage, relevanceContext) are non-empty strings.
- Per session decision (1a) acceptance is deterministic regex matching
  without a runtime human approval gate.

Wrapper adds 3 tests: scenario-match (binds runner to node --test),
category-coverage (TOK/CPS, CNF, GAP, SET all present), and
tier1-presence (at least one v5.0.0 title or description contains a
tier1 forbidden word).

Tests: 736 to 739 (+3 SC-4 tests). Full suite passes.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/config-audit/tests/scenarios/01-tok-cascade.json

@@ -0,0 +1,29 @@
+{
+  "_meta": {
+    "comment": "Scenario 01: TOK CLAUDE.md cascade exceeds 10k tokens. Covers the TOK/CPS (token-efficiency) category. v5.0.0 title contains tier3 'CLAUDE.md' — humanizer rewrites to non-jargon prose."
+  },
+  "findingId": "CA-TOK-001",
+  "scannerInput": {
+    "id": "CA-TOK-001",
+    "scanner": "TOK",
+    "severity": "high",
+    "title": "CLAUDE.md cascade exceeds 10k tokens per turn",
+    "description": "Total CLAUDE.md cascade is 12450 tokens across 4 files.",
+    "file": ".claude/CLAUDE.md",
+    "line": null,
+    "evidence": "tokens=12450; files=4",
+    "recommendation": "Reduce CLAUDE.md cascade size. Move content into modular skill files or trim verbose sections.",
+    "category": null,
+    "autoFixable": false
+  },
+  "expectedHumanized": {
+    "titlePattern": "instruction files take a lot of space on every turn",
+    "descriptionPattern": "10,000 tokens|every turn carries that weight",
+    "recommendationPattern": "Trim or split the largest files"
+  },
+  "groundTruth": {
+    "what": "The instruction files Claude reads on every turn are large enough that they slow each response.",
+    "why": "The combined size has gone above 10,000 tokens. That weight loads on every turn and leaves less room for the conversation itself.",
+    "whatNext": "Trim or split the largest files. The details show which file contributes most."
+  }
+}