feat: add npx CLI entry point with install, runtime, and IDE detection commands

Replaces the old git-clone installer with a direct npm package copy workflow.
Supports 13 IDE auto-detection targets, runtime delegation to Bun worker,
and pure Node.js install path (no Bun required for installation).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -26,6 +26,9 @@
     "url": "https://github.com/thedotmack/claude-mem/issues"
   },
   "type": "module",
+  "bin": {
+    "claude-mem": "./dist/npx-cli/index.js"
+  },
   "exports": {
     ".": {
       "types": "./dist/index.d.ts",
@@ -97,12 +100,14 @@
   },
   "dependencies": {
     "@anthropic-ai/claude-agent-sdk": "^0.1.76",
+    "@clack/prompts": "^0.9.1",
     "@modelcontextprotocol/sdk": "^1.25.1",
     "ansi-to-html": "^0.7.2",
     "dompurify": "^3.3.1",
     "express": "^4.18.2",
     "glob": "^11.0.3",
     "handlebars": "^4.7.8",
+    "picocolors": "^1.1.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "yaml": "^2.8.2",