fix: add toolkit-evolution to INDEX.json so router can match it (#288)

The skill existed on disk with explicit triggers in its SKILL.md
frontmatter but was never registered in skills/INDEX.json. The
index-router has no fallback to scan SKILL.md files — it only reads
the index — so any request containing "toolkit evolution" or
"evolve toolkit" returned no match.

Added the entry with force_route:true so the multi-word trigger
phrases ("toolkit evolution", "evolve toolkit") produce a guaranteed
force-route rather than relying on word-bag scoring. All 45 benchmark
cases still pass.

Author: notque

skills/INDEX.json

@@ -65,7 +65,7 @@
     },
     "auto-dream": {
       "file": "skills/auto-dream/SKILL.md",
-      "description": "Background memory consolidation and learning graduation \u2014 overnight knowledge lifecycle.",
+      "description": "Background memory consolidation and learning graduation — overnight knowledge lifecycle.",
       "triggers": [
         "dream",
         "consolidate memories",
@@ -815,7 +815,7 @@
     },
     "kairos-lite": {
       "file": "skills/kairos-lite/SKILL.md",
-      "description": "Proactive monitoring \u2014 checks GitHub, CI, and toolkit health, produces briefings.",
+      "description": "Proactive monitoring — checks GitHub, CI, and toolkit health, produces briefings.",
       "triggers": [
         "morning briefing",
         "what happened",
@@ -1689,6 +1689,27 @@
         "distinctive-frontend-design"
       ]
     },
+    "toolkit-evolution": {
+      "file": "skills/toolkit-evolution/SKILL.md",
+      "description": "Closed-loop toolkit self-improvement: diagnose, propose, critique, build, test, evolve.",
+      "triggers": [
+        "evolve toolkit",
+        "improve the system",
+        "self-improve",
+        "toolkit evolution",
+        "what should we improve",
+        "find improvement opportunities",
+        "systematic improvement"
+      ],
+      "category": "meta-tooling",
+      "force_route": true,
+      "user_invocable": true,
+      "version": "1.0.0",
+      "pairs_with": [
+        "multi-persona-critique",
+        "skill-eval"
+      ]
+    },
     "topic-brainstormer": {
       "file": "skills/topic-brainstormer/SKILL.md",
       "description": "Generate blog topic ideas: problem mining, gap analysis, expansion.",