release: v5.9.0 — "Machine-wide token lens" (B1+B2+B3)

Cuts the v5.9.0 release bundling the three hardening gaps shipped since v5.8.0:
B1 (agent-listing budget — new orchestrated scanner AGT, count 15→16),
B2 (machine-wide always-loaded token roll-up in the campaign ledger), and
B3 (cache-aware filtering + stale plugin-cache disk-cleanup finding).

Version sync: plugin.json 5.8.0→5.9.0; README badges version 5.9.0 /
scanners 15→16 / tests 1168→1215; README intro + Health prose + scanner
table (new AGT row, TOK 7th pattern) + self-audit prose 15→16; new
version-history row; CHANGELOG [5.9.0]; CLAUDE.md finding-ID example (+CA-AGT)
and test count 1168→1215 / 67→68 files (scanner dir 35→36).

Gate: `self-audit --json --check-readme` -> readmeCheck.passed:true,
mismatches:[]. Full suite green (1215, 0 fail). Tag + catalog ref-bump follow.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.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": "5.8.0",
+  "version": "5.9.0",
   "author": {
     "name": "Kjell Tore Guttormsen"
   },