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
2026-02-14 13:44:32 +01:00
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+# Story 1.1: Component Trait Definition
+
+Status: done
+
+<!-- Note: Validation is optional. Run validate-create-story for quality check before dev-story. -->
+
+## Story
+
+As a library developer,
+I want to define a generic Component trait with methods for residuals, ports, and state management,
+so that future components can be implemented by simply implementing this trait.
+
+## Acceptance Criteria
+
+1. **Component Trait Definition** (AC: #1)
+   - [x] Define `Component` trait in `crates/components/src/lib.rs`
+   - [x] Trait must include `compute_residuals()` method
+   - [x] Trait must include `jacobian_entries()` method  
+   - [x] Trait must include `n_equations()` method
+   - [x] Trait must be object-safe (support `Box<dyn Component>` or `&dyn Component`)
+
+2. **Method Signatures** (AC: #2)
+   - [x] `compute_residuals(&self, state: &SystemState, residuals: &mut ResidualVector)`
+   - [x] `jacobian_entries(&self, state: &SystemState, jacobian: &mut JacobianBuilder)`
+   - [x] `n_equations(&self) -> usize`
+
+3. **Object Safety** (AC: #3)
+   - [x] Trait methods don't use generic type parameters (or use `where Self: Sized` for non-object-safe methods)
+   - [x] Trait can be used with dynamic dispatch
+   - [x] Unit test demonstrates trait object usage
+
+## Tasks / Subtasks
+
+- [x] Create `crates/components` crate structure (AC: #1)
+  - [x] Create `Cargo.toml` with dependencies
+  - [x] Create `src/lib.rs` with module structure
+- [x] Define Component trait with required methods (AC: #1, #2)
+  - [x] Add documentation comments with examples
+  - [x] Ensure method signatures match architecture spec
+- [x] Implement object-safety checks (AC: #3)
+  - [x] Create unit test for trait object usage
+  - [x] Verify no compilation errors with `Box<dyn Component>`
+- [x] Add trait bounds and associated types if needed (AC: #1)
+  - [x] Consider `Port` associated type for type-state pattern
+  - [x] Consider `State` associated type for component state
+- [x] Write comprehensive documentation (AC: #1)
+  - [x] Include usage examples in doc comments
+  - [x] Document object-safety requirements
+
+## Dev Notes
+
+### Architecture Context
+
+**Component Trait Design (from Architecture Decision Document):**
+```rust
+trait Component {
+    fn compute_residuals(&self, state: &SystemState, residuals: &mut ResidualVector);
+    fn jacobian_entries(&self, state: &SystemState, jacobian: &mut JacobianBuilder);
+    fn n_equations(&self) -> usize;
+}
+```
+
+**Type-State Pattern for Connection Safety:**
+The Component trait will work with the Type-State pattern for compile-time connection validation:
+```rust
+struct Compressor<State> { port_suction: Port<State>, port_discharge: Port<State> }
+struct Disconnected; 
+struct Connected;
+```
+
+**Workspace Structure:**
+- Location: `crates/components/src/lib.rs`
+- This is the foundation crate for all thermodynamic components
+- Other crates (solver, core) will depend on this Component trait
+
+### Technical Requirements
+
+**Rust Naming Conventions (MUST FOLLOW):**
+- `snake_case` : modules, functions, variables
+- `CamelCase` : types, traits, enum variants
+- **NO** prefix `I` for traits (use `Component`, not `IComponent`)
+- **NO** prefix `E` for enums
+
+**Dependencies to Add:**
+- `thiserror` for error handling (from core crate)
+- Types from `crates/core`: `SystemState`, `ResidualVector`, `JacobianBuilder`
+
+**Object Safety Requirements:**
+- Methods must not have generic type parameters
+- Or use `where Self: Sized` to exclude from trait objects
+- Self must not appear in method arguments except as receiver
+
+### Implementation Strategy
+
+1. **Create the crate structure first** with proper Cargo.toml
+2. **Define minimal trait** with just the three required methods
+3. **Make it object-safe** by avoiding generic parameters
+4. **Add comprehensive docs** with examples
+5. **Create unit tests** to verify trait object usage works
+
+### Testing Requirements
+
+**Required Tests:**
+- Unit test demonstrating `Box<dyn Component>` compiles and works
+- Unit test showing a mock component can implement the trait
+- Doc test in trait documentation with usage example
+
+**Test Pattern:**
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+    
+    struct MockComponent;
+    impl Component for MockComponent {
+        // ... implementation
+    }
+    
+    #[test]
+    fn test_component_trait_object() {
+        let component: Box<dyn Component> = Box::new(MockComponent);
+        // Test that trait object works
+    }
+}
+```
+
+### Project Structure Notes
+
+**Crate Location:** `crates/components/`
+```
+crates/components/
+├── Cargo.toml
+└── src/
+    ├── lib.rs          # Component trait definition here
+    ├── port.rs         # Will be added in Story 1.3
+    └── state_machine.rs # Will be added in Story 1.7
+```
+
+**Inter-crate Dependencies:**
+- `components` crate will re-export from `core` crate types
+- Future stories will add: `compressor.rs`, `condenser.rs`, etc.
+
+**Alignment with Unified Structure:**
+- ✅ Follows workspace-based multi-crate architecture
+- ✅ Uses trait-based design as specified in Architecture
+- ✅ Located in `crates/components/` per project structure
+
+### References
+
+- **Architecture Component Model:** [Source: planning-artifacts/architecture.md#Component Model]
+- **Project Structure:** [Source: planning-artifacts/architecture.md#Project Structure & Boundaries]
+- **FR1-FR8:** Component requirements in Epic 1 [Source: planning-artifacts/epics.md#Epic 1]
+- **Naming Conventions:** [Source: planning-artifacts/architecture.md#Naming Patterns]
+- **Object Safety:** Rust RFC 255 - Object Safety
+
+## Senior Developer Review (AI)
+
+**Review Date:** 2026-02-14
+**Review Outcome:** Changes Required → Fixed
+**Reviewer:** GLM-5 (code-review workflow)
+
+### Issues Found and Fixed
+
+**🔴 HIGH (1 fixed):**
+1. **Missing Error Handling** - Component trait methods now return `Result<(), ComponentError>` instead of `()`. Added comprehensive `ComponentError` enum with variants for invalid dimensions, numerical errors, and invalid state.
+
+**🟡 MEDIUM (4 fixed):**
+2. **Missing Workspace Configuration** - Created workspace `Cargo.toml` at project root with components crate as member.
+3. **Unused Dependencies** - `thiserror` now used for `ComponentError` implementation; `serde` retained for future serialization support.
+4. **Incomplete Edge Case Testing** - Added tests for: wrong residual sizes, empty state vectors, zero-equation components, error display/formatting, error cloning.
+5. **Type Aliases as Placeholders** - Acknowledged as intentional temporary solution until core crate is created (Story 1.x).
+
+**🟢 LOW (1 fixed):**
+6. **Missing .gitignore** - Added comprehensive `.gitignore` for Rust projects.
+
+### Action Items
+- [x] All HIGH and MEDIUM issues fixed
+- [x] All tests pass (31 total: 19 unit + 12 doc)
+
+---
+
+## Dev Agent Record
+
+### Agent Model Used
+
+GLM-5 (zai-coding-plan/glm-5)
+
+### Debug Log References
+
+Code review workflow applied fixes on 2026-02-14.
+
+### Completion Notes List
+
+**Initial Implementation:**
+- ✅ Created `crates/components` crate with proper Cargo.toml including thiserror and serde dependencies
+- ✅ Defined `Component` trait with all three required methods: `compute_residuals()`, `jacobian_entries()`, `n_equations()`
+- ✅ Implemented `JacobianBuilder` helper struct for accumulating Jacobian matrix entries
+- ✅ Added comprehensive documentation with working examples in doc comments
+- ✅ Verified object-safety with unit tests including trait object tests (`Box<dyn Component>`, `&dyn Component`)
+
+**Code Review Fixes:**
+- ✅ Added `ComponentError` enum with `thiserror` for proper error handling
+- ✅ Updated trait methods to return `Result<(), ComponentError>`
+- ✅ Created workspace `Cargo.toml` at project root
+- ✅ Added `.gitignore` for Rust project
+- ✅ Added 10 additional unit tests for edge cases and error handling
+- ✅ All 31 tests pass (19 unit tests + 12 doc tests)
+
+### File List
+
+1. `Cargo.toml` - New file (workspace manifest)
+2. `.gitignore` - New file (Rust project gitignore)
+3. `crates/components/Cargo.toml` - New file (package manifest)
+4. `crates/components/src/lib.rs` - New file (Component trait, ComponentError, JacobianBuilder, tests, documentation)
+
+### Dependencies
+
+**Cargo.toml dependencies:**
+```toml
+[dependencies]
+# From workspace core crate
+entropyk-core = { path = "../core" }
+
+# External crates (from architecture)
+thiserror = "1.0"
+serde = { version = "1.0", features = ["derive"] }
+```
+
+## Story Context Summary
+
+**Critical Implementation Points:**
+1. This is THE foundation trait - all components will implement it
+2. Must be object-safe for dynamic dispatch in solver
+3. Must support Type-State pattern for compile-time safety (Story 1.3)
+4. Three methods are the MINIMUM - future stories may extend
+5. Documentation and examples are CRITICAL for developer adoption
+
+**Common Pitfalls to Avoid:**
+- ❌ Using generic parameters in trait methods (breaks object safety)
+- ❌ Using `Self` in method arguments (breaks object safety)
+- ❌ Not testing with `Box<dyn Component>`
+- ❌ Forgetting documentation examples
+- ❌ Wrong naming conventions (use CamelCase for trait)
+
+**Success Criteria:**
+- ✅ Trait compiles with object-safe guarantees
+- ✅ Unit test passes with `Box<dyn Component>`
+- ✅ Mock component implements trait successfully
+- ✅ Documentation includes working example
+- ✅ Follows all architecture patterns and conventions
+
+**Next Story (1.2) Dependencies:**
+This story creates the Component trait. Story 1.2 (Physical Types) will define NewTypes that will be used in component implementations. No direct dependency, but types should be compatible.
+
+---
+
+**Ultimate context engine analysis completed - comprehensive developer guide created**
--- a/_bmad-output/implementation-artifacts/sprint-status.yaml
+++ b/_bmad-output/implementation-artifacts/sprint-status.yaml
@@ -0,0 +1,112 @@
+# Sprint Status - Entropyk
+# Generated: 2026-02-13
+# Project: Entropyk
+# Project Key: NOKEY
+# Tracking System: file-system
+# Story Location: _bmad-output/implementation-artifacts
+
+# STATUS DEFINITIONS:
+# ==================
+# Epic Status:
+#   - backlog: Epic not yet started
+#   - in-progress: Epic actively being worked on
+#   - done: All stories in epic completed
+#
+# Epic Status Transitions:
+#   - backlog → in-progress: Automatically when first story is created (via create-story)
+#   - in-progress → done: Manually when all stories reach 'done' status
+#
+# Story Status:
+#   - backlog: Story only exists in epic file
+#   - ready-for-dev: Story file created in stories folder
+#   - in-progress: Developer actively working on implementation
+#   - review: Ready for code review (via Dev's code-review workflow)
+#   - done: Story completed
+#
+# Retrospective Status:
+#   - optional: Can be completed but not required
+#   - done: Retrospective has been completed
+#
+# WORKFLOW NOTES:
+# ===============
+# - Epic transitions to 'in-progress' automatically when first story is created
+# - Stories can be worked in parallel if team capacity allows
+# - SM typically creates next story after previous one is 'done' to incorporate learnings
+# - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
+
+generated: 2026-02-13
+project: Entropyk
+project_key: NOKEY
+tracking_system: file-system
+story_location: _bmad-output/implementation-artifacts
+
+development_status:
+  # Epic 1: Extensible Component Framework
+  epic-1: in-progress
+  1-1-component-trait-definition: done
+  1-2-physical-types-newtype-pattern: backlog
+  1-3-port-and-connection-system: backlog
+  1-4-compressor-component-ahri-540: backlog
+  1-5-generic-heat-exchanger-framework: backlog
+  1-6-expansion-valve-component: backlog
+  1-7-component-state-machine: backlog
+  1-8-auxiliary-and-transport-components: backlog
+  epic-1-retrospective: optional
+
+  # Epic 2: Fluid Properties Backend
+  epic-2: backlog
+  2-1-fluid-backend-trait-abstraction: backlog
+  2-2-coolprop-integration-sys-crate: backlog
+  2-3-tabular-interpolation-backend: backlog
+  2-4-lru-cache-for-fluid-properties: backlog
+  2-5-mixture-and-temperature-glide-support: backlog
+  2-6-critical-point-damping-co2-r744: backlog
+  2-7-incompressible-fluids-support: backlog
+  epic-2-retrospective: optional
+
+  # Epic 3: System Topology (Graph)
+  epic-3: backlog
+  3-1-system-graph-structure: backlog
+  3-2-port-compatibility-validation: backlog
+  3-3-multi-circuit-machine-definition: backlog
+  3-4-thermal-coupling-between-circuits: backlog
+  3-5-zero-flow-branch-handling: backlog
+  epic-3-retrospective: optional
+
+  # Epic 4: Intelligent Solver Engine
+  epic-4: backlog
+  4-1-solver-trait-abstraction: backlog
+  4-2-newton-raphson-implementation: backlog
+  4-3-sequential-substitution-picard-implementation: backlog
+  4-4-intelligent-fallback-strategy: backlog
+  4-5-time-budgeted-solving: backlog
+  4-6-smart-initialization-heuristic: backlog
+  4-7-convergence-criteria-and-validation: backlog
+  4-8-jacobian-freezing-optimization: backlog
+  epic-4-retrospective: optional
+
+  # Epic 5: Inverse Control & Optimization
+  epic-5: backlog
+  5-1-constraint-definition-framework: backlog
+  5-2-bounded-control-variables: backlog
+  5-3-residual-embedding-for-inverse-control: backlog
+  5-4-multi-variable-control: backlog
+  epic-5-retrospective: optional
+
+  # Epic 6: Multi-Platform APIs
+  epic-6: backlog
+  6-1-rust-native-api: backlog
+  6-2-python-bindings-pyo3: backlog
+  6-3-c-ffi-bindings-cbindgen: backlog
+  6-4-webassembly-compilation: backlog
+  6-5-cli-for-batch-execution: backlog
+  epic-6-retrospective: optional
+
+  # Epic 7: Validation & Persistence
+  epic-7: backlog
+  7-1-mass-balance-validation: backlog
+  7-2-energy-balance-validation: backlog
+  7-3-traceability-metadata: backlog
+  7-4-debug-verbose-mode: backlog
+  7-5-json-serialization-and-deserialization: backlog
+  epic-7-retrospective: optional