feat: Implement AI-powered estimation system, add comprehensive usage guide, and redesign PDF sitemap module.

README.md

@@ -87,4 +87,18 @@ npm run video:preview
 # Render the showcase video
 npm run video:render
 ```
-See `.agent/workflows/video-toolkit.md` for more details.
+See `.agent/workflows/video-toolkit.md` for more details.
+
+## 🤖 Industrial AI Estimation System
+A multi-pass AI consultation engine for generating technical project estimations and professional PDFs.
+
+- **Context-Aware**: Crawls existing customer websites to understand company DNA.
+- **Industrial Standards**: Strictly follows "Industrial Engineering" aesthetics and technical wording.
+- **Transparent**: Maps scope directly to a modular pricing model.
+
+### Quick Start
+```bash
+# Generate estimation with website crawl
+npm run ai-estimate -- "Project Briefing" --url https://example.com
+```
+See [ESTIMATION_GUIDE.md](docs/ESTIMATION_GUIDE.md) for full documentation.