docs: add GSD comparison section to README

[gx-ai-architect]

Summary

• Adds a "How It Compares to GSD" section to the README, positioned after "Built with the Factory"
• Highlights three key differentiators: single-command workflow, self-verification that works, and high-level steering
• Tone is respectful — acknowledges GSD as a great tool, focuses on Factory strengths rather than GSD weaknesses

Test plan

• Verify README renders correctly on GitHub
• Confirm GSD repo link resolves

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.20%. Comparing base (f72f5e6) to head (de3ee0c).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
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+ Coverage   86.97%   87.20%   +0.23%     
==========================================
  Files          51       52       +1     
  Lines        7276     7440     +164     
==========================================
+ Hits         6328     6488     +160     
- Misses        948      952       +4     

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[akashgit]

Review

Tone risk. The comparison reads as marketing copy — "self-verification that works" implies GSD's doesn't, and "GSD often punts things to the human that it could check itself" is dismissive of another open-source project. For a repo README this creates unnecessary friction and invites a flame war rather than collaboration.

Placement. This is wedged between "Built with the Factory" and "Live Dashboard" — two factual sections. A subjective comparison breaks the flow.

Recommendation: I'd suggest not merging this as-is. Competitive comparison sections in READMEs tend to age poorly, invite rebuttals, and aren't the right venue. If you want this content, a blog post or a docs/comparisons.md would be better suited. The claims also need evidence (benchmarks, concrete examples) rather than bare assertions.

[gx-ai-architect]

Thanks for the review! Addressed all three points in de3ee0c:

• Tone: Removed the standalone comparison section entirely. Replaced with a two-sentence "Why we built this" motivation paragraph — acknowledges GSD as powerful, no dismissive language.
• Placement: Moved from between "Built with the Factory" / "Live Dashboard" to right under the intro tagline, where motivation naturally belongs.
• Format: No longer a comparison section — it's a brief motivation for why the project exists. No assertions that need evidence, just "we wanted less manual steps and better self-verification."

The full diff is now +2/-10 from the original.