fix: trigger server release workflows on workflow changes

[monadoid]

Trigger the server-v3 and server-v4 release workflows when their workflow files change, and ignore deleted changeset files during release detection.

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Summary by cubic

Make server-v3 and server-v4 release workflows run when their own workflow files change, and prevent false releases by ignoring deleted changeset files.

• Bug Fixes
  • Trigger on changes to .github/workflows/stagehand-server-v3-release.yml and .github/workflows/stagehand-server-v4-release.yml on pushes to main.
  • Use git diff --diff-filter=d so removed .changeset/*.md files don’t count as changes.

^{Written for commit 3f5911a. Summary will update on new commits. Review in cubic}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3f5911a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant Dev as Developer
    participant GHA as GitHub Actions Trigger
    participant Runner as Release Workflow Runner
    participant Git as Git CLI

    Dev->>GHA: Push to main
    
    Note over GHA: Evaluates path filters
    alt NEW: Workflow file changed OR .changeset/*.md changed
        GHA->>Runner: Start Release Job (v3 or v4)
        
        Runner->>Git: Fetch latest release tag
        Git-->>Runner: latest_tag (e.g., stagehand-server-v3/v1.0.0)
        
        Note over Runner,Git: Identify pending changes
        Runner->>Git: CHANGED: git diff --diff-filter=d --name-only
        Note right of Git: --diff-filter=d ignores files that<br/>were deleted in the current branch
        
        Git-->>Runner: List of added/modified .changeset/*.md files
        
        alt Changes detected
            Runner->>Runner: Execute Build & Publish tasks
        else Only deletions or no changes detected
            Runner->>Runner: Terminate (No new release needed)
        end
    else No relevant paths changed
        GHA-->>Dev: No workflow triggered
    end

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