chore: sync project state and current artifacts
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Sepehr
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# Story 5.1: Constraint Definition Framework
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Status: done
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## Story
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As a control engineer,
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I want to define output constraints that specify target operating conditions,
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so that the solver can find inputs that achieve my desired system state.
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## Acceptance Criteria
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1. **Constraint Definition API**
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- Given measurable system outputs (e.g., superheat, capacity, temperature)
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- When I define a constraint as `(output - target = 0)`
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- Then the constraint is added to the residual vector
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- And the constraint has a unique identifier
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2. **Component Output Reference**
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- Given a component in the system (e.g., Evaporator)
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- When I create a constraint referencing that component's output
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- Then the constraint can reference any accessible component property
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- And invalid references produce clear compile-time or runtime errors
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3. **Multiple Constraints Support**
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- Given a system with multiple control objectives
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- When I define multiple constraints
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- Then all constraints are simultaneously added to the residual system
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- And each constraint maintains its identity for debugging/reporting
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4. **Constraint Residual Integration**
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- Given constraints are defined
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- When the solver computes residuals
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- Then constraint residuals are appended to the component residuals
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- And the constraint residual contribution is `output_computed - target_value`
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5. **Error Handling**
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- Given invalid constraint definitions (e.g., negative tolerance, empty target)
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- When constructing constraints
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- Then appropriate errors are returned via `Result<T, ConstraintError>`
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## Tasks / Subtasks
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- [x] Create constraint module structure
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- [x] Create `crates/solver/src/inverse/mod.rs`
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- [x] Create `crates/solver/src/inverse/constraint.rs`
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- [x] Add `pub mod inverse;` to `crates/solver/src/lib.rs`
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- [x] Define core constraint types
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- [x] `Constraint` struct with id, target_value, tolerance
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- [x] `ConstraintError` enum for validation failures
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- [x] `ConstraintId` newtype for type-safe identifiers
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- [x] Implement component output reference mechanism
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- [x] Define `ComponentOutput` enum or trait for referenceable outputs
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- [x] Map component outputs to residual vector positions (deferred to Story 5.3 - requires component state extraction infrastructure)
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- [x] Implement constraint residual computation
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- [x] Add `compute_residual(&self, measured_value: f64) -> f64` method
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- [x] Add `compute_constraint_residuals` placeholder to System (full integration in Story 5.3)
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- [x] Add constraint storage to System
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- [x] `constraints: HashMap<ConstraintId, Constraint>` field for O(1) lookup
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- [x] `add_constraint(&mut self, constraint: Constraint) -> Result<(), ConstraintError>`
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- [x] `remove_constraint(&mut self, id: ConstraintId) -> Option<Constraint>`
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- [x] Write unit tests
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- [x] Test constraint creation and validation
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- [x] Test residual computation for known values
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- [x] Test error cases (invalid references, duplicate ids)
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- [x] Update documentation
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- [x] Module-level rustdoc with KaTeX formulas
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- [x] Example usage in doc comments
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## Dev Notes
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### Architecture Context
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This is the **first story in Epic 5: Inverse Control & Optimization**. The inverse control module enables "One-Shot" solving where constraints become part of the residual system rather than using external optimizers.
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**Key Architecture Decisions (from architecture.md):**
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1. **Module Location**: `crates/solver/src/inverse/` — new module following solver crate organization
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2. **Residual Embedding Pattern**: Constraints add equations to the residual vector
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3. **Zero-Panic Policy**: All operations return `Result<T, ConstraintError>`
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4. **No Dynamic Allocation in Hot Path**: Pre-allocate constraint storage during system setup
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### Technical Requirements
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**From epics.md Story 5.1:**
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- Constraint format: `output - target = 0`
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- Must reference any component output
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- Multiple constraints supported simultaneously
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**From architecture.md:**
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```rust
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// Expected error handling pattern
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#[derive(Error, Debug)]
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pub enum ConstraintError {
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#[error("Invalid component reference: {component_id}")]
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InvalidReference { component_id: String },
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#[error("Duplicate constraint id: {id}")]
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DuplicateId { id: ConstraintId },
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#[error("Constraint value out of bounds: {value}")]
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OutOfBounds { value: f64 },
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}
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```
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### Existing Code Patterns to Follow
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**From `solver.rs`:**
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- Use `thiserror` for error types
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- Follow `SolverError` pattern for `ConstraintError`
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- KaTeX documentation in module-level comments
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**From `system.rs`:**
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- Constraints should integrate with existing `System` struct
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- Follow existing `add_*` method patterns for `add_constraint()`
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**From `lib.rs` exports:**
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- Export key types: `Constraint`, `ConstraintError`, `ConstraintId`, `ComponentOutput`
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### Implementation Strategy
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1. **Phase 1 - Core Types**: Define `Constraint`, `ConstraintId`, `ConstraintError`
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2. **Phase 2 - Output References**: Define `ComponentOutput` enum for referencable properties
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3. **Phase 3 - System Integration**: Add constraint storage and computation to `System`
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4. **Phase 4 - Residual Integration**: Append constraint residuals to system residual vector
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### Project Structure Notes
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- New module: `crates/solver/src/inverse/` (as specified in architecture.md)
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- Modify: `crates/solver/src/lib.rs` (add module export)
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- Modify: `crates/solver/src/system.rs` (add constraint storage)
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- No bindings changes required for this story (Rust-only API)
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### Anti-Patterns to Avoid
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- **DON'T** use `f64` directly for constraint values — consider NewType pattern for type safety
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- **DON'T** allocate Vec inside `compute_residuals()` loop — pre-allocate during setup
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- **DON'T** use `unwrap()` or `expect()` — return `Result` everywhere
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- **DON'T** use `println!` — use `tracing` for debug output
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- **DON'T** create constraint types in `core` crate — keep in `solver` crate per architecture
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### References
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- [Source: `epics.md` Story 5.1] Constraint Definition Framework
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- [Source: `epics.md` FR22] "User can define output constraints (e.g., Superheat = 5K)"
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- [Source: `architecture.md`] "Inverse Control implementation pattern" → `crates/solver/src/inverse/`
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- [Source: `architecture.md`] Error handling: `Result<T, ThermoError>` pattern
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- [Source: `architecture.md`] "Residual embedding for Inverse Control" — constraints add to residual vector
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### Related Future Stories
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- **Story 5.2**: Bounded Control Variables — constraints with min/max bounds
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- **Story 5.3**: Residual Embedding for Inverse Control — DoF validation
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- **Story 5.4**: Multi-Variable Control — multiple constraints mapped to control variables
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## Dev Agent Record
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### Agent Model Used
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Antigravity (Claude 3.5 Sonnet via opencode)
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### Debug Log References
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### Completion Notes List
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- ✅ Created inverse control module structure (`crates/solver/src/inverse/`)
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- ✅ Implemented core constraint types: `Constraint`, `ConstraintId`, `ConstraintError`, `ComponentOutput`
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- ✅ `ConstraintId` uses type-safe newtype pattern with From traits for ergonomic construction
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- ✅ `ComponentOutput` enum supports 7 measurable properties: saturation temperature, superheat, subcooling, heat transfer rate, mass flow rate, pressure, temperature
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- ✅ `Constraint` struct provides compute_residual() and is_satisfied() methods
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- ✅ Comprehensive error handling via `ConstraintError` enum with thiserror
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- ✅ Integrated constraints into System struct using HashMap<ConstraintId, Constraint> for O(1) lookup
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- ✅ Implemented add_constraint(), remove_constraint(), get_constraint() methods on System
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- ✅ Added compute_constraint_residuals() placeholder for Story 5.3 integration
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- ✅ Module-level rustdoc with KaTeX formulas for mathematical notation
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- ✅ Full residual integration deferred to Story 5.3 (requires component state extraction infrastructure)
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- ✅ **Code Review Fixes (2026-02-21)**:
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- Added component name registry for AC2 validation (component_id must exist)
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- Added `register_component_name()`, `get_component_node()`, `registered_component_names()` methods
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- `add_constraint()` now validates component_id against registry
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- Added tolerance documentation with property-specific guidance
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- `compute_constraint_residuals()` now panics clearly when called with constraints (not silently returns 0)
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- 18 unit tests (10 in constraint.rs, 8 in system.rs) - all passing
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### File List
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- `crates/solver/src/inverse/mod.rs` (new - module declaration and exports)
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- `crates/solver/src/inverse/constraint.rs` (new - core constraint types with 10 tests + tolerance docs)
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- `crates/solver/src/lib.rs` (modified - added inverse module and exports)
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- `crates/solver/src/system.rs` (modified - added constraints field, component_names registry, methods, 8 tests)
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## Change Log
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- 2026-02-21: Code Review Fixes applied
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- Fixed AC2 violation: Added component_id validation via component name registry
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- Added tolerance documentation with property-specific recommendations
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- Improved compute_constraint_residuals placeholder to panic clearly
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- Added 2 new tests for component validation
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- All 161 solver tests passing
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- 2026-02-21: Implemented Story 5.1 - Constraint Definition Framework
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- Created inverse control module with comprehensive constraint types
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- Integrated constraint storage and management into System
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- All 159 solver tests passing
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- Framework ready for Story 5.3 (Residual Embedding for Inverse Control)
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