Modular LaTeX CV: scaffolding, 13 chapters, altacv styling

Replace the monolithic ODT with a modular LaTeX source tree that becomes
the canonical full CV:

- preamble.tex: altacv color/font overrides + compact-row macros
  (\cvrow, \cvgrant, \cvtalk, \cvalum, \cvpub) so dense lists keep
  baseline-aligned dates without the tabularx misalignment the
  custom v1 had.
- cv-full.tex: driver including the 13 chapters in order.
- chapters/*.tex: header, positions, education, grants, teaching,
  examinations, service, talks, collaborators, alumni, publications,
  products (solo-founded flyRoom + Berengar), software.
- tex-vendor/altacv.cls (v1.7.4): vendored, not in TeX Live.
- Makefile: dockerised xelatex build via texlive/texlive:latest,
  with TEXINPUTS=.:./tex-vendor: so the vendored class resolves.

Output: 6-page build/cv-full.pdf (down from 10 in the first pass).

chapters/products.tex

@@ -0,0 +1,16 @@
+% Chapter: Commercial products (solo-founded by GFG)
+% Locally override altacv's location marker with a globe icon for URLs.
+\begingroup
+\renewcommand{\cvLocationMarker}{\faGlobe}
+
+\cvsection{Commercial products}
+
+\cvevent{Solo founder}{flyRoom}{since 2026}{\href{https://www.flyroom.net}{flyroom.net}}
+\textit{``Manage your fly stocks, not spreadsheets.''} A SaaS platform for \textit{Drosophila} research labs to track stocks, plan crosses, and collaborate across institutions.
+
+\divider
+
+\cvevent{Solo founder}{Berengar}{since 2026}{\href{https://www.berengar.io}{berengar.io}}
+\textit{``Just put Berengario in CC.''} A retrieval-augmented email assistant that learns from a team's documents and emails to answer questions with sourced replies.\par
+
+\endgroup