fix(ci): fix YAML indentation in sisyphus-agent workflow heredoc
PR #439 added ultrawork-mode content without proper YAML indentation. In GitHub Actions run: | blocks, all lines must be indented at least as much as the first content line. The unindented heredoc content broke YAML parsing, causing 'workflow file issue' failures. 🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
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