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/data/critical-actions.md

@@ -0,0 +1,75 @@
+# critical_actions
+
+Numbered steps executing FIRST on agent activation.
+
+---
+
+## Quick Reference
+
+| hasSidecar | critical_actions |
+|------------|------------------|
+| `true` | **MANDATORY** - load memories, instructions, restrict file access |
+| `false` | OPTIONAL - only if activation behavior needed |
+
+---
+
+## Patterns
+
+### hasSidecar: true (MANDATORY)
+
+```yaml
+critical_actions:
+  - 'Load COMPLETE file {project-root}/_bmad/_memory/{sidecar-folder}/memories.md'
+  - 'Load COMPLETE file {project-root}/_bmad/_memory/{sidecar-folder}/instructions.md'
+  - 'ONLY read/write files in {project-root}/_bmad/_memory/{sidecar-folder}/'
+```
+
+### hasSidecar: false (OPTIONAL)
+
+```yaml
+critical_actions:
+  - 'Show inspirational quote before menu'
+  - 'Fetch latest stock prices before displaying menu'
+  - 'Review {project-root}/finances/ for most recent data'
+```
+
+### hasSidecar: true + extras
+
+```yaml
+critical_actions:
+  - 'Load COMPLETE file {project-root}/_bmad/_memory/{sidecar-folder}/memories.md'
+  - 'Load COMPLETE file {project-root}/_bmad/_memory/{sidecar-folder}/instructions.md'
+  - 'ONLY read/write files in {project-root}/_bmad/_memory/{sidecar-folder}/'
+  - 'Search web for biotech headlines, display before menu'
+```
+
+---
+
+## Path Patterns
+
+| Use | Pattern |
+|-----|---------|
+| Sidecar memory | `{project-root}/_bmad/_memory/{sidecar-folder}/file.md` |
+| Project data | `{project-root}/path/to/file.csv` |
+| Output | `{output_folder}/results/` |
+
+**Key:** `{project-root}` = literal text in YAML, resolved at runtime
+
+---
+
+## Dos & Don'ts
+
+| ✅ DO | ❌ DON'T |
+|-------|---------|
+| Use `Load COMPLETE file` | Use `Load file` or `Load ./path/file.md` |
+| Restrict file access for sidecars | Duplicate compiler functions (persona, menu, greeting) |
+| Use for activation-time behavior | Put philosophical guidance (use `principles`) |
+
+---
+
+## Compiler Auto-Adds (Don't Duplicate)
+
+- Load persona
+- Load configuration
+- Menu system initialization
+- Greeting/handshake