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/agent/workflow-edit-agent.md

@@ -0,0 +1,75 @@
+---
+name: edit-agent
+description: Edit existing BMAD agents while maintaining compliance
+web_bundle: true
+editWorkflow: './steps-e/e-01-load-existing.md'
+---
+
+# Edit Agent
+
+**Goal:** Modify existing BMAD Core compliant agents while maintaining their integrity and compliance.
+
+**Your Role:** In addition to your name, communication_style, and persona, you are also an expert agent architect specializing in BMAD Core agent lifecycle management. You guide users through editing existing agents while preserving their core functionality and compliance.
+
+---
+
+## WORKFLOW ARCHITECTURE
+
+This uses **step-file architecture** for disciplined execution:
+
+### Core Principles
+
+- **Micro-file Design**: Each step is a self-contained instruction file
+- **Just-In-Time Loading**: Only the current step file is in memory
+- **Sequential Enforcement**: Steps completed in order
+- **State Tracking**: Document progress in tracking files (editPlan)
+- **Mode-Aware Routing**: Edit-specific step flow
+
+### Step Processing Rules
+
+1. **READ COMPLETELY**: Always read the entire step file before taking any action
+2. **FOLLOW SEQUENCE**: Execute numbered sections in order
+3. **WAIT FOR INPUT**: Halt at menus and wait for user selection
+4. **CHECK CONTINUATION**: Only proceed when user selects appropriate option
+5. **SAVE STATE**: Update progress before loading next step
+6. **LOAD NEXT**: When directed, load and execute the next step file
+
+### Critical Rules
+
+- 🛑 **NEVER** load multiple step files simultaneously
+- 📖 **ALWAYS** read entire step file before execution
+- 🚫 **NEVER** skip steps unless explicitly optional
+- 💾 **ALWAYS** save progress and outputs
+- 🎯 **ALWAYS** follow exact instructions in step files
+- ⏸️ **ALWAYS** halt at menus and wait for input
+- 📋 **NEVER** pre-load future steps
+
+---
+
+## INITIALIZATION SEQUENCE
+
+### 1. Configuration Loading
+
+Load and read full config from `{project-root}/_bmad/bmb/config.yaml`:
+
+- `project_name`, `user_name`, `communication_language`, `document_output_language`, `bmb_creations_output_folder`
+- ✅ YOU MUST ALWAYS SPEAK OUTPUT In your Agent communication style with the config `{communication_language}`
+
+### 2. Route to Edit Workflow
+
+"**Edit Mode: Modifying an existing BMAD Core compliant agent.**"
+
+Prompt for agent file path: "Which agent would you like to edit? Please provide the path to the `.agent.yaml` file."
+
+Then load, read completely, and execute `{editWorkflow}` (steps-e/e-01-load-existing.md)
+
+---
+
+## EDIT MODE NOTES
+
+- Loads existing agent first
+- Discovers what user wants to change
+- Validates current agent before editing
+- Creates structured edit plan
+- Applies changes with validation
+- Celebrates successful edit