Add spec-kit-auto skill for autonomous end-to-end development

[jeremyeder]

Summary

• Adds spec-kit-auto skill that orchestrates the full superpowers workflow chain autonomously: specify, plan, implement, simplify, lint/security, finish
• Takes complete user input as authoritative spec, resolves ambiguity from project context, and runs the entire pipeline without human interaction between phases
• Adds plugin manifest (.claude-plugin/plugin.json) for skill auto-discovery

What the skill does

1. Specify — enriches user input into formal spec doc using project context
2. Plan — invokes superpowers:writing-plans for bite-sized TDD tasks
3. Implement — uses superpowers:subagent-driven-development with worktree isolation
4. Simplify — runs /simplify for code reuse, quality, and efficiency review
5. Lint & Security — auto-detects project linters, runs CodeRabbit CLI, dispatches inline security review subagent
6. Finish — verification-before-completion + finishing-a-development-branch

Test plan

• Verify skill is discoverable via plugin auto-discovery
• Verify global symlink at ~/.claude/skills/spec-kit-auto works
• Test invocation with a complete spec in a new session
• Verify all six phases execute in order without unnecessary user prompts

🤖 Generated with Claude Code

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[jeremyeder]

Closing: skill incorrectly routes through superpowers:* skills instead of using the speckit.* skill chain. Will be rewritten.