chore: bring the reviewed PR chain into main

[PSamuele]

What

PRs #4 to #16 were merged into their own base branch, not into main, so the work never reached main: it all sits on top of chore/remove-example-results. This PR closes the chain.

It also brings main (PR #15 roadmap and PR #19 README) into the chain, so the merge is clean.

Conflict resolved

One conflict in README.md, in the "Aerodynamics" section: PR #19 added "(uniformally distributed)" to the panel-method description, PR #8 changed the XFOIL line just below. Both changes are kept. "uniformally" is spelled "uniformly".

Also in this commit

The "Roadmap" section is removed from the README: the same items are in TODO.md (#15), and two lists would drift apart. The Limitations section now links to TODO.md.

Verified

Merge reproduced locally: README.md is the only conflict, and on the merged tree python tests/baseline_check.py gives 24/24.

After merging

main will contain everything: naca_core/ with the shared core and the export, tests/, the updated READMEs and TODO.md. The branches of the merged PRs can be deleted.

[Filettus-newkeyboard]

Per me va bene, vedo solo che dei pezzi di codice nella review sono stati interamente cancellati. Se intendevi toglierli, allora approvo

[PSamuele]

Sì, sono tutte volute. La #20 non aggiunge cancellazioni sue: raccoglie le PR dalla #4 alla #16, che hai già approvato una per una, e confrontate tutte insieme con il main vecchio sembrano tante.