Add claude-his-agent package (arch=any + debian Architecture: all)

- arch/claude-his-agent/PKGBUILD: fetches v0.1.0 tarball from
  git.reauktion.de/marfrit/claude-his-agent, installs agent+skill+helper
  to /usr/share/claude-agents/, /usr/share/claude-skills/his/, /usr/bin/
- debian/claude-his-agent/: control+changelog+copyright + build-deb.sh
  mirroring the lmcp-debian pattern (dpkg-deb, reproducible mtimes)
- .gitea/workflows/build.yml: two new serialized jobs (claude-his-any +
  claude-his-debian) after lmcp-debian; same publish flow as lmcp.

arch/claude-his-agent/PKGBUILD

@@ -0,0 +1,22 @@
+# Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+# Home Infrastructure Specialist subagent + skill for Claude Code.
+# Source of truth: git.reauktion.de/marfrit/claude-his-agent
+
+pkgname=claude-his-agent
+pkgver=0.1.0
+pkgrel=1
+pkgdesc="Home Infrastructure Specialist subagent + skill for Claude Code (mfritsche home infra)"
+arch=('any')
+url="https://git.reauktion.de/marfrit/claude-his-agent"
+license=('custom')
+depends=('bash')
+source=("${pkgname}-${pkgver}.tar.gz::https://git.reauktion.de/marfrit/claude-his-agent/archive/v${pkgver}.tar.gz")
+sha256sums=('d1e953632c3cf52ef9cd6ab51d2878808f99fb031931bbc99f6a554501dfc14e')
+
+package() {
+    cd "${pkgname}"
+    install -Dm644 agents/his.md             "${pkgdir}/usr/share/claude-agents/his.md"
+    install -Dm644 skills/his/SKILL.md       "${pkgdir}/usr/share/claude-skills/his/SKILL.md"
+    install -Dm755 scripts/claude-his-install "${pkgdir}/usr/bin/claude-his-install"
+    install -Dm644 README.md                 "${pkgdir}/usr/share/doc/${pkgname}/README.md"
+}