chore: restore system packages lost in base image migration

The migration from debian:stable-slim to nousresearch/hermes-agent:latest
dropped several packages that were previously installed. This restores:

- poppler-utils, imagemagick (PDF/image processing)
- texlive-latex-base, latex-extra, fonts-recommended, xetex, science
- qemu-user-static, binfmt-support (cross-compilation)
- emacs-nox (text editing)

These were added in PRs 3/5, 4/5, 5/5 and earlier commits of the
compose repo. The official image already has git, curl, ffmpeg,
python3, gcc, openssh, ripgrep, tini, docker-cli, etc.

ai/Dockerfile

@@ -6,12 +6,30 @@ FROM ghcr.io/astral-sh/uv:latest AS uv_source
 FROM nousresearch/hermes-agent:latest
 
 # ---------- System dependencies ----------
-# Piper a besoin de libportaudio2, et HuggingFace a besoin de ca-certificates
+# The official hermes-agent image already has: git, curl, ffmpeg, python3,
+# gcc, build-essential, openssh-client, procps, tini, ripgrep, docker-cli,
+# libportaudio2, ca-certificates, etc.
+#
+# These extras we need to add back:
+#   - poppler-utils, imagemagick  (PDF/image processing)
+#   - texlive-*                   (LaTeX typesetting for reports)
+#   - qemu-user-static, binfmt-support (QEMU cross-compilation)
+#   - emacs-nox                   (text editing in container)
 USER root
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
         libportaudio2 \
-        ca-certificates && \
+        ca-certificates \
+        poppler-utils \
+        imagemagick \
+        texlive-latex-base \
+        texlive-latex-extra \
+        texlive-fonts-recommended \
+        texlive-xetex \
+        texlive-science \
+        qemu-user-static \
+        binfmt-support \
+        emacs-nox && \
     rm -rf /var/lib/apt/lists/*
 
 # ---------- UV (hyperfast pip alternative) ----------