feat(jujutsu): add enableJujutsuIntegration to home-manager options (#482)

Co-authored-by: Ben Vinegar <ben@benv.ca>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: 3 people

.changeset/nix-jujutsu-integration.md

@@ -0,0 +1,5 @@
+---
+"hunkdiff": minor
+---
+
+Add an `enableJujutsuIntegration` home-manager option that sets hunk as the jujutsu pager and switches `ui.diff-formatter` to `:git` so jj emits diffs hunk can render.

nix/home-manager.nix

@@ -43,6 +43,12 @@ in
       description = "Whether to set hunk as the default git pager.";
     };
 
+    enableJujutsuIntegration = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Whether to set hunk as the default jujutsu pager. Also sets ui.diff-formatter to \":git\" so jj emits git-style diffs hunk can render.";
+    };
+
     enableClaudeIntegration = mkOption {
       type = types.bool;
       default = false;
@@ -59,6 +65,13 @@ in
 
     programs.git.settings.core.pager = mkIf cfg.enableGitIntegration "hunk pager";
 
+    programs.jujutsu.settings = mkIf cfg.enableJujutsuIntegration {
+      ui = {
+        diff-formatter = ":git";
+        pager = "hunk pager";
+      };
+    };
+
     home.file = mkIf cfg.enableClaudeIntegration {
       ".claude/skills/hunk-review".source = "${cfg.package}/skills/hunk-review";
     };