refactor: rename goup-util → utm-dev (github.com/joeblew999/utm-dev)

Full rename across all source files, go.mod, examples, CI workflows,
docs, and mise tasks. Binary is now `utm-dev`. CLI docs regenerated
(86 files, all utm-dev_*.md). docs/adr/ preserved with all 6 ADRs.

Next: rename GitHub repo from goup-util → utm-dev.

Author: joeblew999

.github/workflows/build.yml

@@ -17,13 +17,13 @@ jobs:
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-    - name: Build goup-util with obfuscation
+    - name: Build utm-dev with obfuscation
       run: mise run ci
 
     - name: Verify JSON output
       run: |
         echo "Testing self version command..."
-        ./.dist/goup-util-darwin-arm64 self version | jq .
+        ./.dist/utm-dev-darwin-arm64 self version | jq .
 
     - name: List built binaries
       run: |
@@ -33,5 +33,5 @@ jobs:
     - name: Upload all artifacts
       uses: actions/upload-artifact@v4
       with:
-        name: goup-util-all-platforms
+        name: utm-dev-all-platforms
         path: .dist/*

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
       uses: softprops/action-gh-release@v2
       with:
         files: |
-          .dist/goup-util-*
+          .dist/utm-dev-*
           .dist/*.sh
           .dist/*.ps1
         generate_release_notes: true