chore(humanizer): pre-flight snapshots + test audit for v5.1.0

Wave 0 / Step 0 of the v5.1.0 plain-language UX humanizer plan.

Captures v5.0.0 baseline output for all 8 CLIs at
tests/snapshots/v5.0.0/ — these snapshots are immutable references
for SC-6 (--json byte-equal) and SC-7 (--raw byte-equal) tests in
later waves.

- 5 CLIs captured via --output-file: scan-orchestrator, posture,
  token-hotspots-cli, manifest, whats-active
- 3 CLIs captured via stdout redirect (no --output-file support):
  drift-cli (after baseline seed), fix-cli, plugin-health-scanner
- Posture stderr scorecard captured separately for SC-7 stderr-mode
  comparison

docs/v5.1.0-test-audit.md classifies all 42 .title references in
7 known test files: 34 will break under humanization (literal
string equality / substring), 8 are safe (test fixtures or error
formatting). This document is the change list for Step 4.

Project: .claude/projects/2026-05-01-config-audit-ux-redesign/

plugins/config-audit/tests/snapshots/v5.0.0/plugin-health.json

@@ -0,0 +1,14 @@
+{
+  "scanner": "PLH",
+  "status": "ok",
+  "files_scanned": 1,
+  "duration_ms": 17,
+  "findings": [],
+  "counts": {
+    "critical": 0,
+    "high": 0,
+    "medium": 0,
+    "low": 0,
+    "info": 0
+  }
+}