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/bmm/workflows/4-implementation/sprint-status/workflow.yaml

@@ -0,0 +1,30 @@
+# Sprint Status - Implementation Tracker
+name: sprint-status
+description: "Summarize sprint-status.yaml, surface risks, and route to the right implementation workflow."
+author: "BMad"
+
+# Critical variables from config
+config_source: "{project-root}/_bmad/bmm/config.yaml"
+output_folder: "{config_source}:output_folder"
+user_name: "{config_source}:user_name"
+communication_language: "{config_source}:communication_language"
+document_output_language: "{config_source}:document_output_language"
+date: system-generated
+implementation_artifacts: "{config_source}:implementation_artifacts"
+planning_artifacts: "{config_source}:planning_artifacts"
+
+# Workflow components
+installed_path: "{project-root}/_bmad/bmm/workflows/4-implementation/sprint-status"
+instructions: "{installed_path}/instructions.md"
+
+# Inputs
+variables:
+  sprint_status_file: "{implementation_artifacts}/sprint-status.yaml"
+  tracking_system: "file-system"
+
+# Smart input file references
+input_file_patterns:
+  sprint_status:
+    description: "Sprint status file generated by sprint-planning"
+    whole: "{implementation_artifacts}/sprint-status.yaml"
+    load_strategy: "FULL_LOAD"