Promote custom content columns in datagrids from experimental to stable

[ako]

Description

Datagrids with custom content columns (edit/delete buttons) work via `CREATE OR MODIFY`, but the skill docs mark these as "experimental" and they may show warnings in Studio Pro. Edit and delete buttons in grids are a fundamental CRUD pattern and should be fully supported.

Current State

Custom content columns with action buttons can be created but:

• Marked as experimental in skill documentation
• May produce warnings in Studio Pro
• No round-trip fidelity guarantee

Suggested Fix

• Test and stabilize custom content column BSON serialization
• Remove "experimental" label from skill docs
• Ensure DESCRIBE roundtrip produces clean output for pages with action columns

Impact

Medium — edit/delete buttons in grids are used in virtually every CRUD app.

[github-actions]

Issue Triage

Summary:
The issue requests that custom content columns with edit/delete buttons in datagrids be promoted from experimental to stable in mxcli.

Checklist for feature request

Required info	Present?	Details
Use case – why the feature is needed / problem it solves	✅	Describes that edit/delete buttons are a fundamental CRUD pattern and currently marked experimental, causing warnings.
Proposed syntax or behavior (if applicable)	⚠️	Mentions stabilizing BSON serialization, removing the “experimental” label, and ensuring clean DESCRIBE round‑trip, but does not give concrete CLI syntax or exact behavior changes.
Mendix version relevance (if version‑specific)	❌	No indication of which Mendix versions the change should apply to or any version‑specific constraints.

What’s missing / could be clarified

• Please specify the Mendix version(s) you target (e.g., 9.x, 10.x) or note if the change is version‑agnostic.
• If possible, outline the exact CLI behavior you expect after the change (e.g., mxcli describe output format, any new flags, or how the skill docs should reflect the stable status).

If you can add those details, the issue will be ready for review. Thanks for the contribution!

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