docs: note the CSV field value size limit in record parsing

[devin-ai-integration]

What

Documents an undocumented limit users hit with no warning: a CSV response value larger than roughly 131,000 characters makes the CSV decode fail, and nothing in the connector or connection configuration hints that a per-value cap exists. A customer lost records from three streams to this (a 152,579-character free-text field) before support identified the cause.

The fix is in flight in the CDK (airbytehq/airbyte-python-cdk#1114 raises the declarative parser's limit to 2**31). This note covers the gap in the meantime — it should be removed or reworded once that ships and reaches connectors.

How

One :::warning admonition in the existing ### CSV section of record-processing.mdx, next to the description of how the CSV decoder converts rows to JSON objects. States the limit, that oversized values fail rather than truncate, and what to do about it.

Review guide

1. docs/platform/connector-development/connector-builder-ui/record-processing.mdx

User Impact

Users who hit field larger than field limit (131072) can now identify the cause from the docs instead of filing a support ticket. Docs-only, no behavior change.

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

Link to Devin session: https://app.devin.ai/sessions/474c9fe5bfca4e21acce8d128cba3c8a

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