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/header.tex

@@ -0,0 +1,16 @@
+% Chapter: Header — uses altacv's \name, \tagline, \personalinfo, \makecvheader
+\name{Giorgio F. Gilestro, PhD}
+\tagline{Associate Professor in Systems Neurobiology \textbar{} Imperial College London}
+
+\personalinfo{%
+  \email{g.gilestro@imperial.ac.uk}
+  \email{giorgio@gilest.ro}
+  \phone{+44 (0)\,770 8280834}
+  \homepage{lab.gilest.ro}
+  \blog{giorgio.gilest.ro}
+  \github{gilestrolab}
+  \github{ggilestro}
+  \location{Department of Life Sciences, Imperial College London, UK}
+}
+
+\makecvheader