Add multi-wavelength spectroscopy tutorial#203

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aditya-pandey-dev wants to merge 14 commits intoJuliaAstro:mainfrom

aditya-pandey-dev:add-spectroscopy-tutorial

Commits on Mar 20, 2026

Commits on Mar 31, 2026

Fix: address all cgarling review comments
aditya-pandey-dev
committed

Commits on Apr 1, 2026

Fix: address all cgarling review comments
aditya-pandey-dev
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Fix: use plain julia blocks (Spectra.jl not in General registry yet)
aditya-pandey-dev
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Fix: correct Cosmology.jl UUID in docs/Project.toml
aditya-pandey-dev
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Fix: revert docs/Project.toml to original - plain julia blocks need no extra deps
aditya-pandey-dev
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Fix: complete tutorial rewrite - CairoMakie, no Plots.jl, all mentor fixes applied
aditya-pandey-dev
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Fix: use real SDSS DR14 spectrum with ivar-based uncertainties in Part 1
aditya-pandey-dev
committed