refactor: suffix runtimeDeps PATH so apt-installed tools take priority

Changes makeWrapper from --prefix to --suffix. In container mode,
tools installed via apt in /usr/bin now win over read-only nix store
copies. Nix store versions become dead-letter fallbacks. Native NixOS
mode unaffected — tools in /run/current-system/sw/bin already precede
the suffix.

nix/packages.nix

@@ -35,7 +35,7 @@
 
           ${pkgs.lib.concatMapStringsSep "\n" (name: ''
             makeWrapper ${hermesVenv}/bin/${name} $out/bin/${name} \
-              --prefix PATH : "${runtimePath}" \
+              --suffix PATH : "${runtimePath}" \
               --set HERMES_BUNDLED_SKILLS $out/share/hermes-agent/skills
           '') [ "hermes" "hermes-agent" "hermes-acp" ]}