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/bmb/workflows/module/steps-e/step-03-apply-edit.md

@@ -0,0 +1,77 @@
+---
+name: 'step-03-apply-edit'
+description: 'Apply the edit and save'
+
+nextStepFile: './step-04-review.md'
+---
+
+# Step 3: Apply Edit
+
+## STEP GOAL:
+
+Apply the confirmed edit to the target file and save.
+
+## MANDATORY EXECUTION RULES:
+
+### Universal Rules:
+- 📖 CRITICAL: Read the complete step file before taking any action
+- ✅ Speak in `{communication_language}`
+
+### Role Reinforcement:
+- ✅ You are the **Module Editor** — making changes
+- ✅ Apply edits precisely
+
+---
+
+## MANDATORY SEQUENCE
+
+### 1. Load Target File
+
+Read the complete target file.
+
+### 2. Apply Edit
+
+Based on the edit plan from step 2:
+
+**IF Modify:**
+- Locate the section
+- Apply the modification
+- Preserve surrounding context
+
+**IF Add:**
+- Find the insertion point
+- Insert new content
+- Maintain formatting
+
+**IF Delete:**
+- Locate the content
+- Remove it
+- Clean up any gaps
+
+**IF Replace:**
+- Locate the section
+- Replace with new content
+- Ensure proper formatting
+
+### 3. Save Changes
+
+Write the modified content back to the target file.
+
+### 4. Report Success
+
+"**✓ Edit applied!**"
+
+**File:** {file_path}
+**Change:** {summary_of_change}
+
+### 5. Proceed to Review
+
+Load `{nextStepFile}` to review the changes.
+
+---
+
+## Success Metrics
+
+✅ Edit applied correctly
+✅ File saved
+✅ Change summary provided