docs: sync Mintlify guides with recent OpenAPI changes

[claude]

Summary

Syncs Mintlify documentation with recent OpenAPI schema changes:

• configuring-customers.mdx: Fix invalid routing number 987654321 in USD account examples, using checksum-valid 021000021 instead (aligns with commit b3ca94a)
• quote-system.mdx: Document the 202 SCA pause response when using immediatelyExecute: true with EU customers (aligns with commit 117cec2)

Context

This PR addresses documentation gaps found during the weekly docs sync review. The OpenAPI schema was updated with:

• Checksum-valid routing numbers in USD account examples
• A new 202 response on POST /quotes for immediate execution with SCA

The Mintlify guides had hardcoded examples and missing documentation that needed alignment.

Test plan

• make lint passes
• Verify routing number examples render correctly in Mintlify preview
• Verify SCA documentation reads correctly in quote-system.mdx

🤖 Generated with Claude Code

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3 Skipped Deployments

Project	Deployment	Actions	Updated
grid-cards-demo	Ignored		Oct 14, 2026 8:19am UTC
grid-flow-builder	Ignored		Oct 14, 2026 8:19am UTC
grid-wallet-demo	Ignored		Oct 14, 2026 8:19am UTC

[mintlify]

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Project	Status	Preview	Updated
Grid	🟢 Ready	View Preview	Oct 14, 2026, 8:20 AM

[greptile-apps]

Confidence Score: 5/5

[Low impact] The PR appears safe to merge; both documentation updates match the OpenAPI spec.

Summary

Updates two Mintlify guides to match the OpenAPI spec.

• Both USD account examples use the same routing number.
• The quote guide explains SCA authorization for immediate quotes.

Diagram

sequenceDiagram
  participant Client
  participant Grid
  Client->>Grid: POST /quotes (immediatelyExecute: true)
  Grid-->>Client: 202 PENDING_AUTHORIZATION + scaChallenge
  loop Until all required challenges are satisfied
    Client->>Grid: "POST /quotes/{quoteId}/authorize with proof"
    Grid-->>Client: Updated quote status
  end
  Note over Grid: Transfer proceeds after authorization

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