chore: add BMAD agent workflows and configuration system

- Add comprehensive agent workflow definitions for 8 specialized roles (analyst, architect, developer, product manager, scrum master, technical writer, UX designer, QA engineer)
- Add 35+ workflow definitions covering analysis, planning, solutioning, and implementation phases
- Add BMAD configuration system with agent, task, tool, workflow, and file manifests
- Add BMM (Business Model Methodology) documentation including quick-start guides, architecture references, and workflow analysis
- Add test architecture knowledge base with 20+ testing patterns and best practices
- Add team configuration templates and party mode setup for collaborative development
- Establish foundation for enterprise agentic development framework with adaptive scaling capabilities

.bmad/core/resources/excalidraw/library-loader.md

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+# External Library Loader
+
+**Status:** Placeholder for future implementation
+
+## Purpose
+
+Load external .excalidrawlib files from https://libraries.excalidraw.com or custom sources.
+
+## Planned Capabilities
+
+- Load libraries by URL
+- Load libraries from local files
+- Merge multiple libraries
+- Filter library components
+- Cache loaded libraries
+
+## API Reference
+
+Will document how to use:
+
+- `importLibrary(url)` - Load library from URL
+- `loadSceneOrLibraryFromBlob()` - Load from file
+- `mergeLibraryItems()` - Combine libraries
+
+## Usage Example
+
+```yaml
+# Future workflow.yaml structure
+libraries:
+  - url: 'https://libraries.excalidraw.com/libraries/...'
+    filter: ['aws', 'cloud']
+  - path: '{project-root}/_data/custom-library.excalidrawlib'
+```
+
+## Implementation Notes
+
+This will be developed when agents need to leverage the extensive library ecosystem available at https://libraries.excalidraw.com.
+
+Hundreds of pre-built component libraries exist for:
+
+- AWS/Cloud icons
+- UI/UX components
+- Business diagrams
+- Mind map shapes
+- Floor plans
+- And much more...
+
+## User Configuration
+
+Future: Users will be able to configure favorite libraries in their BMAD config for automatic loading.