cometsfactory 0.0.3

Comet factory — classify, build and catalogue comets of any type: short-period, long-period, Halley-type, sungrazer, interstellar, main-belt comet, centaur-transition, and extinct.
Documentation 
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# Coming Soon

## Current State (v0.0.1)
- 8 comet types (ShortPeriod, LongPeriod, HalleyType, Sungrazer, Interstellar, MainBeltComet, CentaurTransition, Extinct)
- Full builder pattern for all types
- Physics: gravity + sublimation (gas production, non-gravitational acceleration)
- Engine: orbital mechanics, nucleus evolution, coma/tail modelling
- Observables: photometry + tail orientation/structure
- 73 tests, 3 examples

## Planned Features

### v0.0.2
- Dust grain size distribution models (power-law, Hanner)
- Fragmentation cascade simulation
- Spectroscopic emission line ratios (CN, C₂, C₃)
- Improved non-gravitational force model (A1, A2, A3 parameters)
- Seasonal activity patterns from nucleus shape/obliquity
- Synchrone/syndyne generator for dust tail analysis

### v0.0.3
- Full 3D nucleus shape models (ellipsoid, Cheops)
- Jet source region mapping from rotation
- Gas-dust interaction (drag acceleration on grains)
- Thermophysical models with heat conduction
- Disconnection event prediction from solar wind data
- Striae formation from fragmentation events

### Future
- Binary/contact binary comet nuclei
- Impact-driven activity triggers
- Volatile species beyond H₂O: CO, CO₂, HCN, CH₃OH
- Outburst energy/magnitude modelling
- Integration with SolarSystems::orbital_propagator