docs(cards): add substatus and reason to status change examples

[claude]

Summary

Updates card documentation to reflect the new requirement that card status changes must include substatus and reason fields (OpenAPI change a0c00c0).

• Updated mintlify/snippets/cards/freezing-and-closing.mdx:
  • Table now shows that substatus and reason are required alongside status
  • Added explanation paragraph about the new requirements
  • Updated freeze and close curl examples to include substatus and reason
• Updated mintlify/snippets/cards/funding-sources.mdx:
  • Updated freeze example to include substatus and reason
  • Updated closing paragraph to reference the full documentation

No changes needed for:

• Exchange rates (sendingAmount > 0 constraint): Passing zero or negative amounts was never a documented pattern
• Kotlin sample app: No card status change code
• Grid Visualizer: Doesn't deal with cards or exchange rate queries

Test plan

• Verify docs render correctly with make mint
• Check that curl examples are valid JSON

🤖 Generated with Claude Code

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3 Skipped Deployments

Project	Deployment	Actions	Updated
grid-cards-demo	Ignored		Sep 17, 2026 8:20am UTC
grid-flow-builder	Ignored		Sep 17, 2026 8:20am UTC
grid-wallet-demo	Ignored		Sep 17, 2026 8:20am UTC

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Project	Status	Preview	Updated
Grid	🟢 Ready	View Preview	Sep 17, 2026, 8:22 AM

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; the changed examples and links align with the card update contract and documentation structure.

Summary

This documentation-only PR updates card status-change guidance to require substatus and reason.

• Updates freeze and close requests with valid, non-empty values.
• Clarifies the required fields in the transition table and funding-source guidance.
• Links readers to the card update reference and complete freezing and closing documentation.

_{Reviews (1) · Last reviewed commit: "docs(cards): add substatus and reason to..."}