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/data/agent-spec-template.md

@@ -0,0 +1,79 @@
+# Agent Specification: {agent_name}
+
+**Module:** {module_code}
+**Status:** Placeholder — To be created via create-agent workflow
+**Created:** {date}
+
+---
+
+## Agent Metadata
+
+```yaml
+agent:
+  metadata:
+    id: "_bmad/{module_code}/agents/{agent_file_name}.md"
+    name: {agent_human_name}
+    title: {agent_title}
+    icon: {agent_icon}
+    module: {module_code}
+    hasSidecar: false
+```
+
+---
+
+## Agent Persona
+
+### Role
+
+{agent_role}
+
+### Identity
+
+{agent_identity}
+
+### Communication Style
+
+{agent_communication_style}
+
+### Principles
+
+{agent_principles}
+
+---
+
+## Agent Menu
+
+### Planned Commands
+
+| Trigger | Command | Description | Workflow |
+|---------|---------|-------------|----------|
+{agent_menu_table}
+
+---
+
+## Agent Integration
+
+### Shared Context
+
+- References: `{shared_context_files}`
+- Collaboration with: {collaborating_agents}
+
+### Workflow References
+
+{workflow_references}
+
+---
+
+## Implementation Notes
+
+**Use the create-agent workflow to build this agent.**
+
+Inputs needed:
+- Agent name and human name
+- Role and expertise area
+- Communication style preferences
+- Menu commands and workflow mappings
+
+---
+
+_Spec created on {date} via BMAD Module workflow_