@gurupanguji

Plan: Shell quoting guard

• Add the spec and plan documents.
• Patch repo AGENTS.md and GEMINI.md.
• Patch shared ~/.agents/AGENTS.md and ~/.agents/GEMINI.md.
• Patch ~/.agents/personal/working-style.md.
• Verify the new rule appears in all five files.
• Commit, push, and open a PR for the repo changes.