Fix artifact search to use tag commit SHA instead of workflow commit

The create-release workflow was searching for builds using context.sha (the commit where the workflow file was updated) instead of the actual tag's commit SHA. This caused it to not find successful builds for tags.

Solution: Look up the tag's commit SHA and search for workflow runs that built that specific commit.

🤖 Generated with [Claude Code](https://claude.ai/code)

Author: Bryan Howard

.github/workflows/create-release.yml

@@ -55,18 +55,27 @@ jobs:
           script: |
             const artifactName = `PyFlowGraph-Windows-${{ inputs.tag_name }}`;
             
-            // Search for workflow runs that built this tag
+            // Get the commit SHA for the tag
+            const tagRef = await github.rest.git.getRef({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              ref: 'tags/${{ inputs.tag_name }}'
+            });
+            const tagSha = tagRef.data.object.sha;
+            console.log(`Tag ${{ inputs.tag_name }} points to commit: ${tagSha}`);
+            
+            // Search for workflow runs that built this specific commit
             const workflowRuns = await github.rest.actions.listWorkflowRunsForRepo({
               owner: context.repo.owner,
               repo: context.repo.repo,
               workflow_id: 'windows-build.yml',
-              head_sha: context.sha,
+              head_sha: tagSha,
               status: 'completed',
               conclusion: 'success'
             });
             
             if (workflowRuns.data.workflow_runs.length === 0) {
-              throw new Error(`No successful build found for tag ${{ inputs.tag_name }}`);
+              throw new Error(`No successful build found for tag ${{ inputs.tag_name }} (commit: ${tagSha})`);
             }
             
             const runId = workflowRuns.data.workflow_runs[0].id;