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

.agent/workflows/bmad-cis-problem-solving.md

@@ -0,0 +1,15 @@
+---
+name: 'problem-solving'
+description: 'Apply systematic problem-solving methodologies to crack complex challenges. This workflow guides through problem diagnosis, root cause analysis, creative solution generation, evaluation, and implementation planning using proven frameworks.'
+disable-model-invocation: true
+---
+
+IT IS CRITICAL THAT YOU FOLLOW THESE STEPS - while staying in character as the current agent persona you may have loaded:
+
+<steps CRITICAL="TRUE">
+1. Always LOAD the FULL @{project-root}/_bmad/core/tasks/workflow.xml
+2. READ its entire contents - this is the CORE OS for EXECUTING the specific workflow-config @{project-root}/_bmad/cis/workflows/problem-solving/workflow.yaml
+3. Pass the yaml path @{project-root}/_bmad/cis/workflows/problem-solving/workflow.yaml as 'workflow-config' parameter to the workflow.xml instructions
+4. Follow workflow.xml instructions EXACTLY as written to process and follow the specific workflow config and its instructions
+5. Save outputs after EACH section when generating any documents from templates
+</steps>