Add 1-page short CV variant, ORCID, profile photo, pre-commit hook

- cv-short.tex: two-column paracol layout (66/34) with curated content
  in the left column and an "at a glance" sidebar on the right.
  Locally tightens parskip, \cvsection and \cvevent so everything fits
  on a single A4 page, and redefines the sidebar list helper \sbitem
  to replace altacv's non-wrapping tikz \cvtag in the narrow column.
- chapters/short/{current,education,grants-selected,products,
  pubs-selected,sidebar}.tex: hand-curated highlight content
  (top 6 publications, top 6 grants, condensed two-line products,
  stats + recognition + leadership + research-focus sidebar blocks).
- chapters/header.tex / preamble.tex: ORCID 0000-0001-7512-8541
  via a new \orcid info field (faOrcid icon); blog field for
  giorgio.gilest.ro.
- images/gilestro.png: profile photo, used only by the short CV via
  altacv's circular \photoR.
- hooks/pre-commit + `make install-hooks`: rebuilds every variant on
  any .tex/.cls/Makefile change, aborts the commit on build failure,
  and stages refreshed PDFs into pdf/.
- Makefile: short target, hook-install target, dep glob extended to
  chapters/short/*.tex so the short build refreshes when its sources
  change.

chapters/short/products.tex

@@ -0,0 +1,9 @@
+% Commercial products -- condensed version for the short CV.
+% Single line per product: bold name, URL, year, one-line pitch.
+\cvsection{Commercial products}
+
+\noindent\textbf{flyRoom}\ \ {\small\color{LightGrey}(\href{https://www.flyroom.net}{flyroom.net},\,2026, solo founder)} \\
+\textit{``Manage your fly stocks, not spreadsheets.''}\ SaaS for \textit{Drosophila} stock management and lab collaboration.\par\smallskip
+
+\noindent\textbf{Berengar}\ \ {\small\color{LightGrey}(\href{https://www.berengar.io}{berengar.io},\,2026, solo founder)} \\
+\textit{``Just put Berengario in CC.''}\ Retrieval-augmented email assistant for team knowledge.\par