feat: add bitcoin-ai-tools skill (Sats4AI)

[cnghockey]

Summary

• Adds bitcoin-ai-tools skill: teaches agents how to use Sats4AI — a Bitcoin-powered AI tools marketplace
• 33+ services (image gen, video, audio, OCR, translation, communication) paid per request with Bitcoin Lightning
• No API keys, no accounts, no KYC — agents just need a Lightning wallet

Replaces #20 (closed — missing DCO signoff).

Test plan

• validate CI check passes (skill structure)
• security_scan CI check passes (URL warnings expected — sats4ai.com docs links)
• DCO check passes
• Verify skill works in Goose by following the payment flow in the skill instructions

Generated with Claude Code

[github-actions]

✅ Validate Skills — PASSED

Summary: FAIL=0 · WARN=0
Changed skill dirs: bitcoin-ai-tools

Output (last 200 lines)

✅ Found 8 skill directories.
✅ api-setup: structure validated
✅ beads: structure validated
✅ bitcoin-ai-tools: structure validated
✅ code-review: structure validated
✅ frontend-design: structure validated
✅ goose-blog-post: structure validated
✅ rp-why: structure validated
✅ testing-strategy: structure validated

Structure validation PASSED.

[github-actions]

🛡️ Skills Security Scan — WARN

Summary: FAIL=0 · WARN=7 · FILES=1
Changed skills scanned: bitcoin-ai-tools

⚠️ WARN requires investigation + CODEOWNERS review.

⚠️ Warnings

bitcoin-ai-tools

• network:url — bitcoin-ai-tools/SKILL.md:34

URL: https://sats4ai.com/api/mcp

Guidance: Review: URL present; confirm expected destination and purpose.

• network:url — bitcoin-ai-tools/SKILL.md:128

4. remove_background({ paymentId: "pay_abc", imageUrl: "https://example.com/photo.jpg" })

Guidance: Review: URL present; confirm expected destination and purpose.

• network:url — bitcoin-ai-tools/SKILL.md:129

   → { resultUrl: "https://sats4ai.com/results/photo-nobg.png" }

Guidance: Review: URL present; confirm expected destination and purpose.

• network:url — bitcoin-ai-tools/SKILL.md:141

- Docs: https://sats4ai.com/mcp

Guidance: Review: URL present; confirm expected destination and purpose.

• network:url — bitcoin-ai-tools/SKILL.md:142

- Discovery manifest: https://sats4ai.com/.well-known/mcp

Guidance: Review: URL present; confirm expected destination and purpose.

• network:url — bitcoin-ai-tools/SKILL.md:143

- Tool catalog with pricing: https://sats4ai.com/api/mcp/discovery

Guidance: Review: URL present; confirm expected destination and purpose.

• network:url — bitcoin-ai-tools/SKILL.md:144

- npm: https://www.npmjs.com/package/sats4ai-mcp

Guidance: Review: URL present; confirm expected destination and purpose.

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Notes: This comment auto-updates on each push to keep PRs clean.

[cnghockey]

Pinging for review — this PR has been rebased on latest main and DCO signoff is in place. Ready for security review and merge. Let us know if anything else is needed.