release(config-audit): v5.1.0 — plain-language UX humanizer

Plain-language UX humanizer release. Default output of all 18 commands
now leads with prose; technical IDs surface at end-of-line as references
rather than headlines. Scanner internals are unchanged; humanization is
a pure output-time transform applied at the rendering layer.

Highlights:
- New scanner-lib modules: humanizer.mjs, humanizer-data.mjs (TRANSLATIONS
  for 13 scanner prefixes)
- New --raw flag threaded through every CLI for byte-stable v5.0.0
  verbatim output (--json unchanged from v5.0.0, also byte-stable)
- 5 user-impact categories, 5 action-language phrases, 3 relevance contexts
- Self-audit terminal output also humanized; --json path unchanged
- 21 command and agent templates updated for humanized rendering with
  --raw passthrough
- 635 → 792 tests (+157) including SC-3 forbidden-words lint, SC-4
  scenario read-test, SC-5/6/7 backwards-compat snapshots

Migration:
- Existing --json automation: zero changes required (envelope is
  byte-stable with v5.0.0; humanizer fields are bypassed)
- stderr-scraping tooling: review default mode (now uses prose); pass
  --raw for v5.0.0 verbatim
- No scanner-internal changes (IDs, severity ladders, scoring weights,
  area scorecards all unchanged)

Verification:
- 792/792 tests pass
- self-audit configGrade A (97), pluginGrade A (100), readmeCheck passed
- README badge: tests-635+ → tests-792+

plugins/config-audit/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "config-audit",
   "description": "Multi-agent workflow for analyzing, reporting, and optimizing Claude Code configuration across your entire machine",
-  "version": "5.0.0",
+  "version": "5.1.0",
   "author": {
     "name": "Kjell Tore Guttormsen"
   },