chore(config-audit): bump version to 5.0.0

- .claude-plugin/plugin.json: 4.0.0 → 5.0.0
- README.md: version badge bump + v5.0.0 row in Version History
- CHANGELOG.md: consolidated `## [5.0.0]` entry covering alpha.1, alpha.2,
  beta.1, rc.1 — Summary, Added, Changed, Removed, Breaking changes,
  Migration notes, Tests, Notes (incl. SC-6b deferred-to-implementation-log)
- root README.md: Config-Audit row v4.0.0 → v5.0.0; counts updated
  (8→12 scanners, 17→18 commands, 543→635 tests, 4→6 patterns,
  +manifest command, +--accurate-tokens, +CPS/DIS/COL coverage)

No code changes in this commit.

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

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": "4.0.0",
+  "version": "5.0.0",
   "author": {
     "name": "Kjell Tore Guttormsen"
   },