feat(skill-listing): add SKL scanner for the skill-listing token budget

Fase 4 Items 2+3 (CC 2.1.114→181 gap-review). New orchestrated scanner
`skill-listing-scanner.mjs` (prefix SKL) flags every active skill whose
description exceeds the verified 1,536-char listing cap (CC 2.1.105, changelog
L1502). Past the cap, Claude Code silently truncates the description the model
reads to route skill invocation — dropping the trigger phrases at the tail.
HOME-scoped over all user + plugin skills via enumerateSkills (COL is the model).

- CA-SKL-001 (medium): description > 1,536 chars. Remediation folds in Item
  2(b) — recommends disableBundledSkills + skillOverrides + trimming
  (designvalg A: no standalone GAP-check, which would fire for nearly everyone).
- Designvalg B: v1 ships the verified cap ONLY. The aggregate 2%-of-context
  listing budget is deferred — it needs a context-window assumption that would
  turn a verified fact into a guess (would carry a CALIBRATION_NOTE if added).
- Choice C: recognize the skillOverrides settings key (CC 2.1.129) in
  KNOWN_KEYS. Left OUT of TYPE_CHECKS — the value is a per-skill object
  (off/user-invocable-only/name-only), not a string; a 'string' check (as the
  plan sketched) would create a NEW false positive. Verify-first deviation.

Registration: scan-orchestrator (13th scanner), humanizer (SKL → 'Wasted
tokens' + static/_default translations), scoring SCANNER_AREA_MAP (→ Token
Efficiency; no 11th area), README badge 12→13, CLAUDE.md (finding-id +
test-count), docs/scanner-internals.md, gap-matrix + plan status notes.

Snapshots reseeded hermetically (SEED_SNAPSHOT/UPDATE_SNAPSHOT): SKL entry with
0 findings in empty HOME, scanners_ok 11→12, claudeMdEstimatedTokens bump from
the CLAUDE.md edits flowing through the cascade. Contamination grep clean.

Suite 868/868 (856 baseline + 11 SKL + 1 skillOverrides). RED→GREEN logged
per cycle.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ter3E2JSi1Khgmuf2kady8

scanners/lib/humanizer-data.mjs

@@ -730,4 +730,24 @@ export const TRANSLATIONS = {
       recommendation: 'See the details for what needs to change.',
     },
   },
+
+  // ─────────────────────────────────────────────────────────────
+  // SKL — Skill-Listing Budget
+  // Category: Wasted tokens
+  // ─────────────────────────────────────────────────────────────
+  SKL: {
+    static: {
+      'Skill description exceeds the listing cap (Claude Code truncates it)': {
+        title: 'A skill description is too long and gets cut off',
+        description: 'Claude Code only shows the first part of each skill\'s description when it decides which skill to use. This one runs past the limit, so the end — often the trigger phrases — is silently dropped.',
+        recommendation: 'Shorten the description so the trigger words come first and it fits under the limit. For skills you do not use, turning them off frees up the listing entirely.',
+      },
+    },
+    patterns: [],
+    _default: {
+      title: 'A skill is using more of the listing budget than it should',
+      description: 'A check on how much room your skills take in Claude Code\'s skill listing flagged something worth a look.',
+      recommendation: 'See the details for which skill to trim or turn off.',
+    },
+  },
 };