feat(providers): add Claude Code CLI provider

- implement `ClaudeCodeProvider` using `claude -p` with plain text output
- register `claudecode` as a new provider enum option in package.json
- add `enumDescriptions` for all provider choices
- update API key description to note it is not required for Claude Code
- bump version to 1.1.5

tsconfig.json

@@ -3,6 +3,7 @@
     "target": "ES2020",
     "module": "commonjs",
     "lib": ["ES2020"],
+    "types": ["node"],
     "outDir": "dist",
     "rootDir": "src",
     "strict": true,