docs: implement Phase 2 - API documentation with TypeDoc

Set up TypeDoc to auto-generate comprehensive API reference documentation
from TypeScript source code.

Changes:
- Installed typedoc and typedoc-plugin-markdown (v0.2.0 plugins)
- Created typedoc.json configuration with 9 entry points
- Added docs:api and docs:watch npm scripts
- Fixed test file imports (validateNamespace → isValidNamespace)
- Updated tsconfig.json to exclude test files from compilation
- Generated markdown API documentation in docs/api-reference/generated/

Generated API documentation:
- 9 modules documented (lib/, hooks/, types/)
- lib/crypto - 14 encryption/certificate functions
- lib/controller - 5 Kubernetes API functions
- lib/validators - 6 validation functions
- lib/retry - Exponential backoff utilities
- lib/rbac - RBAC permission checking
- types - Result types, branded types, interfaces
- hooks/useSealedSecretEncryption - Encryption React hook
- hooks/usePermissions - RBAC React hooks
- hooks/useControllerHealth - Health monitoring hook

Benefits:
- Auto-generated from TypeScript source (stays in sync)
- Markdown format for easy integration
- Type signatures and JSDoc included
- Function parameters and return types documented
- Links between related types and functions

Phase 2 deliverables (2-3 days estimated, completed in 1 session):
✅ TypeDoc installed and configured
✅ Entry points identified for all core modules
✅ API documentation generated (9 modules, 40+ functions)
✅ npm scripts added for docs generation
✅ Test files excluded from documentation

Next: Phase 3 - User tutorials and guides

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

headlamp-sealed-secrets/package.json

@@ -30,7 +30,9 @@
     "storybook": "headlamp-plugin storybook",
     "storybook-build": "headlamp-plugin storybook-build",
     "test": "headlamp-plugin test",
-    "i18n": "headlamp-plugin i18n"
+    "i18n": "headlamp-plugin i18n",
+    "docs:api": "typedoc",
+    "docs:watch": "typedoc --watch"
   },
   "keywords": [
     "headlamp",
@@ -60,6 +62,8 @@
   },
   "devDependencies": {
     "@kinvolk/headlamp-plugin": "^0.13.1",
-    "@types/node-forge": "^1.3.11"
+    "@types/node-forge": "^1.3.11",
+    "typedoc": "^0.28.16",
+    "typedoc-plugin-markdown": "^4.10.0"
   }
 }