v0.2.4

[0.2.4] - 2026-09-30

Added

• solvers: Add fixed time-delay support for circuit components (bc47867)
• solvers: Add adaptive step-size support for time-delayed circuits (0b70a75)
• components: Add rational factory functions for vector fitting (6e1aca1)
• components: Add rational_delay_component for vector fitting with delay (4cea3e3)
• solvers: Align fixed delay across analyses (df9b00a)
• Add rational S-parameter fitting (24dc959)
• fitting: Report causality risks (5723327)
• fitting: Add delay-aware models and noisy line tutorial (198e49c)
• Stabilize fitting and delay APIs (0bb4127)
• circuit: Return S-parameters for passive SAX-wrapped circuits (d1a1caa)
• Add live frequency SAX component adapter (0fbe927)

Changed

• Unify component signals and inline delays (e3397fe)
• Stabilize Circuit return types and add explicit SAX export API (0645976)
• deps: Pin core dependencies with compatible ceilings aligned to sax 0.18.2 (5be4095)

Documentation

• specs: Add vector-fitting spec, update time-delay for Phase 4 (b762a91)
• specs: Add baseband-envelope spec for carrier-relative spectral effects (0bfade3)
• specs: Add WDM multi-channel simulation future work section (e43d87e)
• specs: Add physics risks and mitigations to baseband-envelope spec (efd8e7d)
• examples: Demonstrate fixed delay across analyses (d5c198d)
• photonics: Combine TPA with bidirectional delay (4b2162f)
• photonics: Name delayed model as waveguide (6cf30ab)
• notebooks: Fix S-parameter API and MathJax escaping (0e9f790)
• Remove fitting planning notes (3edc62c)

Fixed

• ac_sweep: Fix port impedance and complex voltage reconstruction in 2N solver (b3d8451)
• ac-sweep: Default to safe non-holomorphic solve (8c872b4)
• Stabilize passivity enforcement on Windows (dbd9c01)
• netlist: Drop unreachable instances before model resolution (11e9e77)