Add Claude Code GitHub Workflow

[Balanced02]

🤖 Installing Claude Code GitHub App

This PR adds a GitHub Actions workflow that enables Claude Code integration in our repository.

What is Claude Code?

Claude Code is an AI coding agent that can help with:

• Bug fixes and improvements
• Documentation updates
• Implementing new features
• Code reviews and suggestions
• Writing tests
• And more!

How it works

Once this PR is merged, we'll be able to interact with Claude by mentioning @claude in a pull request or issue comment.
Once the workflow is triggered, Claude will analyze the comment and surrounding context, and execute on the request in a GitHub action.

Important Notes

• This workflow won't take effect until this PR is merged
• @claude mentions won't work until after the merge is complete
• The workflow runs automatically whenever Claude is mentioned in PR or issue comments
• Claude gets access to the entire PR or issue context including files, diffs, and previous comments

Security

• Our Anthropic API key is securely stored as a GitHub Actions secret
• Only users with write access to the repository can trigger the workflow
• All Claude runs are stored in the GitHub Actions run history
• Claude's default tools are limited to reading/writing files and interacting with our repo by creating comments, branches, and commits.
• We can add more allowed tools by adding them to the workflow file like:

allowed_tools: Bash(npm install),Bash(npm run build),Bash(npm run lint),Bash(npm run test)

There's more information in the Claude Code action repo.

After merging this PR, let's try mentioning @claude in a comment on any PR to get started!

[Balanced02]

This PR has several issues that would break the existing setup:

1. Converts reusable workflow to standalone — claude.yml is a workflow_call reusable workflow that other repos (like lisk-mobile) call. Replacing it with direct triggers would break all downstream consumers.

2. Downgrades permissions to read — Claude needs pull-requests: write and issues: write to comment on PRs/issues and push changes. Changing these to read would make Claude unable to respond.

3. Changes secrets reference — ${{ secrets.claude_code_oauth_token }} references the secret passed by the caller via workflow_call.secrets. Changing it to ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }} wouldn't work because reusable workflows can't access repo secrets directly.

4. Removes useful configuration — track_progress, use_sticky_comment, and claude_args with allowed tools are intentionally configured.

The actual fix needed is just updating the caller workflow conditions to support more event types. See #2 for the minimal change.