Initial commit: BMAD framework + Story 1.1 Component Trait Definition

Features:
- BMAD (Build Modular AI-driven Development) framework setup
- BMM, BMB, CIS, Core modules configured
- Story 1.1: Component trait with error handling
- Workspace Cargo.toml with components crate
- 31 tests passing (19 unit + 12 doc tests)

Technical:
- Component trait with compute_residuals, jacobian_entries, n_equations
- ComponentError enum with thiserror
- JacobianBuilder for sparse matrix construction
- Object-safe trait supporting Box<dyn Component>
- Comprehensive documentation and examples

_bmad/cis/workflows/design-thinking/workflow.yaml

@@ -0,0 +1,27 @@
+# Design Thinking Workflow Configuration
+name: "design-thinking"
+description: "Guide human-centered design processes using empathy-driven methodologies. This workflow walks through the design thinking phases - Empathize, Define, Ideate, Prototype, and Test - to create solutions deeply rooted in user needs."
+author: "BMad"
+
+# Critical variables load from config_source
+config_source: "{project-root}/_bmad/cis/config.yaml"
+output_folder: "{config_source}:output_folder"
+user_name: "{config_source}:user_name"
+communication_language: "{config_source}:communication_language"
+date: system-generated
+
+# Context can be provided via data attribute when invoking
+# Example: data="{path}/product-context.md" provides project context
+
+# Module path and component files
+installed_path: "{project-root}/_bmad/cis/workflows/design-thinking"
+template: "{installed_path}/template.md"
+instructions: "{installed_path}/instructions.md"
+
+# Required Data Files
+design_methods: "{installed_path}/design-methods.csv"
+
+# Output configuration
+default_output_file: "{output_folder}/design-thinking-{{date}}.md"
+
+standalone: true