feat: add tractrix, OS, Le Cléac'h, and CD horn profiles

[timini]

Summary

• Adds 4 new horn flare profiles: tractrix, oblate spheroidal (OS), Le Cléac'h, and constant directivity (CD)
• Expands the design space from 3 to 7 profiles across auto/fullauto pipelines
• Each profile has STEP geometry generation, 3D rendering, plot styling, and HTML badge colours

Changes across 13 files

Area	Files	What
Enum	parameters.py	4 new FlareProfile variants
Generator	generator.py	4 new create_*_horn() functions + dispatch
Renderer	horn_render.py	4 vectorised numpy branches in _radius_profile()
Styling	plot_theme.py, html_report.py, single_report.py	Colours, linestyles, badge bg/fg
Defaults	candidates.py, geometry_designer.py	DEFAULT_PROFILES expanded to 7
Pipeline	main.nf	Profile channels updated for auto + render
Tests	4 test files	Smoke tests, volume validation, endpoint checks, grid size assertions

Profile math

Profile	Character	Formula
Tractrix	Rapid initial expansion	Scaled parametric tractrix curve
OS (Geddes)	Smooth wavefront matching	r(z) = sqrt(r_t² + (z·tan θ)²)
Le Cléac'h	Aggressive mouth flare	Clipped tractrix with a = r_mouth
CD	Even coverage angle	30% exponential throat → conical body

Test plan

• 119 core + analysis tests pass
• 17 geometry tests pass (smoke, volume, throat/mouth area, dispatch)
• All 7 STEP geometries generate successfully in auto pipeline
• All 7 3D renders kick off in auto pipeline

🤖 Generated with Claude Code