feat(94-dintel-bootstrap): add MCP agent installer skill

New Claude Skill that wraps the `dintel-bootstrap` CLI from the
dintel-auth package to install and diagnose the three D.intelligence
custom MCP agents (DTM, D.DA, OurSEO) in ~/.claude/settings.json.

Triggers on: "set up MCP agents", "install DTM/D.DA/OurSEO", "run MCP
doctor", "bootstrap a new machine", "my MCP agents stopped working".

Scope boundaries:
- Only registers existing agent installs (does NOT clone agent repos)
- Only touches ~/.claude/settings.json (does NOT modify .mcp.json)
- Does NOT store secrets; OurSEO profile uses op run wrapper
- Does NOT trigger interactive auth; prompts user to run op signin

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

custom-skills/94-dintel-bootstrap/.claude-plugin/plugin.json

@@ -0,0 +1,24 @@
+{
+  "name": "dintel-bootstrap",
+  "version": "1.0.0",
+  "description": "Install and verify D.intelligence custom MCP agents (DTM, D.DA, OurSEO) in ~/.claude/settings.json. Bootstraps a new machine or diagnoses a broken install. Delegates to the `dintel-bootstrap` CLI from the dintel-auth package; clones and installs dintel-auth if missing.",
+  "author": {
+    "name": "D.intelligence",
+    "email": "dev@dintelligence.co.kr"
+  },
+  "keywords": [
+    "bootstrap",
+    "mcp",
+    "dtm",
+    "dda",
+    "ourseo",
+    "claude-code",
+    "install",
+    "doctor",
+    "authentication",
+    "1password",
+    "gcloud",
+    "setup"
+  ],
+  "license": "MIT"
+}