Release v0.1.0-alpha.1

Physics engine working milestone:
- Thermal-electrical coupling simulation
- LDO DUT model with temperature dependence
- Comprehensive test suite

CHANGELOG.md

@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.1.0-alpha.1] - 2025-12-02
+
+### Added
+- Physics engine with thermal-electrical coupling
+- First-order thermal response calculations for chamber and case
+- Junction temperature calculation via thermal resistance (θ_jc)
+- Self-heating effects from power dissipation
+- LDO DUT model with temperature-dependent behaviour
+  - Output voltage temperature coefficient (ppm/°C)
+  - Quiescent current temperature coefficient
+  - Dropout voltage temperature dependence
+  - Power dissipation calculation
+- Comprehensive physics engine test suite (13 tests)
+
 ## [0.0.1] - 2025-12-01
 
 ### Added
@@ -30,5 +44,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 | 0.1.0-beta.1 | TBD | HAL complete |
 | 0.1.0-alpha.3 | TBD | Network ready |
 | 0.1.0-alpha.2 | TBD | Visual demo |
-| 0.1.0-alpha.1 | TBD | Physics engine |
+| 0.1.0-alpha.1 | 2025-12-02 | Physics engine |
 | 0.0.1 | 2025-12-01 | Project scaffolding |