docs: add usage and developer documentation

Add user and developer documentation plus Pagenary docsite publishing support.

Includes Getting Started, Developer Guide, API and MCP references, Pagenary tenant metadata, npm scripts for sync/build/check/serve, and validation coverage for the generated docsite.

Closes #102

package.json

@@ -52,6 +52,11 @@
     "tools:check": "bash scripts/check-tools-image.sh",
     "tools:build": "bash tools/build.sh",
     "install:tools": "bash scripts/install-tools.sh",
+    "docs:sync": "node scripts/pagenary-docsite.mjs",
+    "docs:build": "npm run docs:sync && pagenary build t3mp3st-docs",
+    "docs:serve": "npm run docs:build && pagenary serve",
+    "docs:preview": "npm run docs:serve",
+    "docs:check": "npm run docs:build && node scripts/check-pagenary-docsite.mjs",
     "mcp": "tsx src/mcp-server.ts",
     "mcp:prod": "node dist/mcp-server.js",
     "test": "vitest run src && node scripts/test-ops-preflight.mjs",
@@ -130,6 +135,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.39.2",
+    "@pagenary/publisher": "^2026.7.24",
     "@types/cors": "^2.8.17",
     "@types/express": "^4.17.21",
     "@types/figlet": "^1.5.8",