feat: add clippy and cargo test as dev pre-commit hooks

Splits git hooks into two configurations: a sandbox-safe set for
`nix flake check` (rustfmt + commitizen) and a full dev set installed
via `nix develop` that also runs clippy (deny warnings) and cargo test.

flake.nix

@@ -141,6 +141,36 @@
           };
         };
 
+      mkGitHooksDev =
+        system:
+        let
+          pkgs = mkPkgs system;
+          toolchain = pkgs.rust-bin.stable.latest.default;
+        in
+        git-hooks.lib.${system}.run {
+          src = ./.;
+          hooks = {
+            rustfmt = {
+              enable = true;
+              package = toolchain;
+            };
+            clippy = {
+              enable = true;
+              package = toolchain;
+              settings.denyWarnings = true;
+            };
+            cargo-test = {
+              enable = true;
+              name = "cargo test";
+              entry = "${toolchain}/bin/cargo test";
+              pass_filenames = false;
+              language = "system";
+              files = "\\.(rs|toml)$";
+            };
+            commitizen.enable = true;
+          };
+        };
+
       mkMuslCraneLib =
         system:
         let
@@ -199,6 +229,21 @@
         in
         craneLib.buildPackage (commonArgs // { inherit cargoArtifacts; });
 
+      mkZedExtensionZip =
+        system:
+        let
+          pkgs = mkPkgs system;
+          zed-extension = mkZedExtension system;
+        in
+        pkgs.runCommand "streamd-zed-extension-${version}.zip" {
+          nativeBuildInputs = [ pkgs.zip ];
+        } ''
+          mkdir -p streamd-zed-extension
+          cp ${zed-extension}/extension.toml streamd-zed-extension/
+          cp ${zed-extension}/extension.wasm streamd-zed-extension/
+          zip -r $out streamd-zed-extension
+        '';
+
       mkStreamdDeb =
         system:
         let
@@ -250,9 +295,10 @@
           streamd-deb = mkStreamdDeb system;
           streamd-windows = mkStreamdWindows system;
           zed-extension = mkZedExtension system;
+          zed-extension-zip = mkZedExtensionZip system;
         in
         {
-          inherit streamd streamd-musl streamd-deb streamd-windows zed-extension;
+          inherit streamd streamd-musl streamd-deb streamd-windows zed-extension zed-extension-zip;
           default = streamd;
         }
       );
@@ -339,7 +385,7 @@
             ];
 
             shellHook = ''
-              ${(mkGitHooksCheck system).shellHook}
+              ${(mkGitHooksDev system).shellHook}
             '';
           };
         }