Post build artifact links as PR comments

- Add post-artifacts job to c-cpp.yml that comments a table of
  artifact download links on PRs after all builds complete
- Remove broken artifacts.yml (used unmaintained action on deprecated
  windows-2019, workflow_run trigger never fired for fork PRs)

Closes #60

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: JoeMatt

.github/workflows/artifacts.yml

@@ -6,6 +6,10 @@ on:
   pull_request:
     branches: [ master ]
 
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
   build:
     strategy:
@@ -75,3 +79,60 @@ jobs:
         name: ${{ matrix.config.displayTargetName }}
         path: ${{ matrix.config.artifact }}
         if-no-files-found: error
+
+  post-artifacts:
+    if: github.event_name == 'pull_request'
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Comment artifact links on PR
+      continue-on-error: true
+      uses: actions/github-script@v7
+      with:
+        script: |
+          const runUrl = `${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`;
+
+          const comments = await github.paginate(
+            github.rest.issues.listComments,
+            {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              per_page: 100,
+            }
+          );
+          const marker = '<!-- build-artifacts -->';
+          const existing = comments.find(c => c.body.includes(marker));
+
+          const body = [
+            marker,
+            '### Build Artifacts',
+            '',
+            '| Platform | Download |',
+            '|----------|----------|',
+            '| Linux x86_64 (GCC) | [virtualjaguar_libretro.so](' + runUrl + ') |',
+            '| Linux x86_64 (Clang) | [virtualjaguar_libretro.so](' + runUrl + ') |',
+            '| Linux aarch64 | [virtualjaguar_libretro.so](' + runUrl + ') |',
+            '| macOS arm64 | [virtualjaguar_libretro.dylib](' + runUrl + ') |',
+            '| Windows x86_64 | [virtualjaguar_libretro.dll](' + runUrl + ') |',
+            '',
+            '> Download artifacts from the [workflow run](' + runUrl + ').',
+            '',
+            `<sub>Updated by CI at ${new Date().toISOString()}</sub>`,
+          ].join('\n');
+
+          if (existing) {
+            await github.rest.issues.updateComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              comment_id: existing.id,
+              body,
+            });
+          } else {
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body,
+            });
+          }