Add MkDocs Material documentation site with 40 pages and auto-generated API reference

Sets up a complete documentation website with 7 navigable sections (Home, Getting
Started, User Guide, Architecture, API Reference, Deployment, Development), light/dark
mode, search, code copy, and Mermaid diagram support. API reference pages use
mkdocstrings to auto-generate docs from source docstrings. GitHub Actions workflow
deploys to GitHub Pages on push to main.

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

docs/api/intelligence.md

@@ -0,0 +1,47 @@
+# Intelligence Module
+
+The intelligence module handles model management and query routing. It
+provides the `HeuristicRouter` which selects models based on query
+characteristics (code detection, math detection, query length, urgency),
+and a model catalog of well-known local and cloud models with their
+specifications.
+
+## Heuristic Router
+
+### HeuristicRouter
+
+::: openjarvis.intelligence.router.HeuristicRouter
+    options:
+      show_source: true
+      members_order: source
+
+### build_routing_context
+
+::: openjarvis.intelligence.router.build_routing_context
+    options:
+      show_source: true
+
+---
+
+## Model Catalog
+
+Built-in catalog of well-known model specifications, including local models
+(Qwen, Llama, Mistral, DeepSeek) and cloud models (OpenAI, Anthropic, Google).
+
+### BUILTIN_MODELS
+
+::: openjarvis.intelligence.model_catalog.BUILTIN_MODELS
+    options:
+      show_source: true
+
+### register_builtin_models
+
+::: openjarvis.intelligence.model_catalog.register_builtin_models
+    options:
+      show_source: true
+
+### merge_discovered_models
+
+::: openjarvis.intelligence.model_catalog.merge_discovered_models
+    options:
+      show_source: true