docs: Update documentation for controller PR #2120

[tarrencev]

This PR updates the documentation to reflect changes made in cartridge-gg/controller#2120

**Original PR Details:**
- Title: fix: disable cc payment in starterpack
- Files changed: packages/keychain/src/components/purchasenew/method.tsx

Please review the documentation changes to ensure they accurately reflect the controller updates.

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Note

Updates purchasing docs to crypto-only payments, removing credit card references and adjusting flow and starterpack sections accordingly.

• Docs (Controller Purchasing Guide):
  • Remove all fiat/credit card references and the unified payment interface, making payments crypto-only across the page (src/pages/controller/purchasing.md).
  • Update purchase flow to show only cryptocurrency method selection; remove Stripe mentions; keep Layerswap cross-chain bridging details.
  • Revise paid starterpack description to crypto-only; retain Layerswap for cross-chain payments.
  • Minor wording tweak to wallet integration bullet (multi-wallet phrasing).

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Project	Deployment	Preview	Updated (UTC)
docs	Ready	Preview	Oct 16, 2025 5:29pm

[claude]

Claude finished @tarrencev's task —— View job

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Documentation Review Complete ✅

I've reviewed the documentation changes for controller PR #2120 which disabled CC payment in starterpack functionality.

Todo List

• Read repository guidelines (CLAUDE.md)
• Analyze the changed documentation file
• Review changes for accuracy and quality
• Provide comprehensive feedback on code quality, bugs, performance, security, and test coverage
• Submit review feedback

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Review Feedback

✅ Code Quality & Best Practices

The documentation changes are well-executed and maintain consistency with the existing structure:

• Clear and accurate: All references to credit card payments have been properly removed
• Consistent terminology: The changes maintain the existing documentation style and voice
• Proper markdown formatting: All formatting remains intact and follows documentation standards

✅ Content Accuracy

The changes accurately reflect the controller PR #2120 that disabled CC payment functionality:

• Line 9: Correctly removes "both traditional payment methods (credit cards) and" from the overview
• Line 20: Removes the duplicate "Unified Payment Interface" bullet point that referenced fiat payments
• Lines 229 & 231: Updates starterpack payment method descriptions to remove credit card references
• Lines 274-275: Removes credit card payment step from the purchase flow
• Line 231: Updates payment provider description to remove Stripe reference

✅ No Issues Found

Potential Bugs: None identified - this is a straightforward documentation update with no executable code.

Performance Considerations: No performance impact - these are static markdown documentation changes.

Security Concerns: No security issues - the changes actually improve security posture by removing references to a disabled payment method, preventing user confusion.

Test Coverage: Not applicable for documentation changes, though the changes align with the controller codebase modifications.

✅ Additional Observations

1. Completeness: The changes comprehensively remove all credit card payment references without missing any instances
2. User Experience: The documentation now accurately reflects the current functionality, preventing user confusion about unsupported payment methods
3. Consistency: The removal of duplicate content (line 20) improves documentation quality
4. Maintenance: The changes are minimal and focused, reducing maintenance burden

Recommendation

✅ APPROVE - This documentation update accurately reflects the controller changes and maintains high quality standards. The changes are thorough, consistent, and improve user experience by removing references to disabled functionality.

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