feat(config-audit): remove TOK Pattern D detectSonnetEra (v5 F5)

Pattern D was the v4 sonnet-era signature: 'config is structurally
clean but uses no Opus-4.7-specific features'. Two problems:
- It triggered on any minimal config that happened to lack skills/MCP
- The advice was generic and not actionable

The hotspots ranking and per-pattern findings (A/B/C) cover the same
ground with concrete, file-anchored signal. Dropping the noise.

BREAKING (intentional): scanners no longer emit the sonnet-era info
finding. Suppression entries and downstream tooling that reference
the v4 finding ID should be updated. Doc sweep follows in Step 8b.

Tests: sonnet-era fixture now asserts zero findings.

plugins/config-audit/scanners/token-hotspots.mjs

@@ -1,14 +1,18 @@
 /**
  * TOK Scanner — Token Hotspots / Opus 4.7 patterns
  *
- * Detects four structural Opus 4.7-era token-efficiency patterns:
+ * Detects three structural Opus 4.7-era token-efficiency patterns:
  *   CA-TOK-001  cache-breaking volatile top in CLAUDE.md (medium)
  *   CA-TOK-002  redundant tool/permission declarations (low)
  *   CA-TOK-003  deep @import chain (>2 hops) (medium)
- *   CA-TOK-004  sonnet-era signature — clean config with no Opus 4.7 features (info)
+ *
+ * Note: the v4 sonnet-era signature pattern was removed in v5 F5 — too noisy
+ * and not actionable; live token costs are better surfaced by the hotspots
+ * ranking and per-pattern findings.
  *
  * Also ranks every discovered config source by estimated tokens and exposes
- * a `hotspots` array (3–10 entries) on the scanner result.
+ * a `hotspots` array (≤10 entries, possibly fewer for tiny projects) on the
+ * scanner result.
  *
  * Pattern catalogue: knowledge/opus-4.7-patterns.md
  * Token heuristic:   estimateTokens() in scanners/lib/active-config-reader.mjs
@@ -151,25 +155,6 @@ function detectRedundantPermissions(settings) {
   return issues;
 }
 
-/**
- * Detect "sonnet-era" signature: the configuration is structurally clean
- * but uses no Opus 4.7-specific features (no skills, no managed-settings,
- * no plugin imports, no MCP servers, minimal hooks).
- */
-function detectSonnetEra(discovery) {
-  const types = new Set(discovery.files.map(f => f.type));
-  const hasSkill = types.has('skill-md');
-  const hasMcp = types.has('mcp-json');
-  const hasHooks = types.has('hooks-json');
-  const hasManaged = discovery.files.some(f => f.scope === 'managed');
-  const hasPlugin = discovery.files.some(f => f.scope === 'plugin');
-  const hasClaudeMd = types.has('claude-md');
-  const hasSettings = types.has('settings-json');
-  // "Clean baseline" requires CLAUDE.md present; otherwise nothing to flag.
-  if (!hasClaudeMd) return false;
-  return !hasSkill && !hasMcp && !hasHooks && !hasManaged && !hasPlugin && hasSettings;
-}
-
 /**
  * Build the ranked hotspots array.
  *
@@ -334,23 +319,6 @@ export async function scan(targetPath, discovery) {
     }
   }
 
-  // ── Pattern D: sonnet-era signature (info only) ──
-  if (detectSonnetEra(discovery)) {
-    findings.push(finding({
-      scanner: SCANNER,
-      severity: SEVERITY.info,
-      title: 'Sonnet-era configuration signature',
-      description:
-        'The configuration is structurally clean but does not yet leverage Opus 4.7-specific ' +
-        'features (no skills, no MCP servers, no plugins, no managed settings, minimal hooks). ' +
-        'Not a defect — a hint that token-efficiency-driven optimisations have not been applied.',
-      recommendation:
-        'Consider adopting Opus 4.7 features that fit the project: skills for shared workflows, ' +
-        'managed settings for cross-repo defaults, or MCP servers for external integrations.',
-      category: 'token-efficiency',
-    }));
-  }
-
   // ── Hotspots ranking ──
   const hotspots = await buildHotspots(discovery, targetPath, activeConfig);
 

plugins/config-audit/tests/scanners/token-hotspots.test.mjs

@@ -87,15 +87,20 @@ describe('TOK scanner — opus-47/deep-imports', () => {
   });
 });
 
-describe('TOK scanner — opus-47/sonnet-era', () => {
+describe('TOK scanner — opus-47/sonnet-era (v5 F5: Pattern D removed)', () => {
   let result;
   beforeEach(async () => {
     result = await runScanner('opus-47/sonnet-era');
   });
 
-  it('emits no findings above info severity', () => {
-    const nonInfo = result.findings.filter(f => f.severity !== 'info');
-    assert.equal(nonInfo.length, 0, `expected only info findings, got: ${nonInfo.map(f => f.id + '=' + f.severity).join(', ')}`);
+  it('emits zero findings (no Pattern D / CA-TOK-004 anymore)', () => {
+    assert.equal(result.findings.length, 0,
+      `expected 0 findings on sonnet-era after F5, got: ${result.findings.map(f => f.id).join(', ')}`);
+  });
+
+  it('never emits CA-TOK-004 (removed in v5)', () => {
+    assert.ok(result.findings.every(f => f.id !== 'CA-TOK-004'),
+      'expected no CA-TOK-004; removed in v5 F5');
   });
 });