chore: sync local config — caveman plugin, command/skill tweaks

- settings.json: enable caveman marketplace+plugin, effortLevel=high
- commands/git-branch + git-push: refactor docs
- skills/parallel-fix-issues: SKILL.md + scripts updates

.claude/settings.json

@@ -19,8 +19,17 @@
     "padding": 1
   },
   "enabledPlugins": {
-    "gopls-lsp@claude-plugins-official": true
+    "gopls-lsp@claude-plugins-official": true,
+    "caveman@caveman": true
   },
-  "skipDangerousModePermissionPrompt": true,
-  "effortLevel": "medium"
+  "extraKnownMarketplaces": {
+    "caveman": {
+      "source": {
+        "source": "github",
+        "repo": "JuliusBrussee/caveman"
+      }
+    }
+  },
+  "effortLevel": "high",
+  "skipDangerousModePermissionPrompt": true
 }