[pbi-fixer] Add fix_isavailable_in_mdx_true: set IsAvailableInMDX=True on visible attribute columns

[KornAlexander]

Adds a sempy_labs fixer fix_isavailable_in_mdx_true() that set IsAvailableInMDX=True on visible attribute columns.

Adds one source file (src/sempy_labs/semantic_model/_Fix_IsAvailableInMdxTrue.py) plus one re-export line in the matching __init__.py. No other files touched, no shared helpers, no dependency on any other PR.

Part of the PBI Fixer contribution. Tracking issue: #1185

[Copilot]

Pull request overview

Adds a new semantic-model fixer, fix_isavailable_in_mdx_true(), intended to correct IsAvailableInMDX metadata on columns that need to remain queryable in MDX-based scenarios. This fits the repo’s growing set of Power BI semantic-model maintenance helpers tracked under the PBI Fixer effort.

Changes:

• Adds a new standalone fixer module that scans model relationships, hierarchies, and key columns, then sets IsAvailableInMDX=True where needed.
• Re-exports the new fixer from sempy_labs.semantic_model.__init__ so it becomes part of the public package surface.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/sempy_labs/semantic_model/_Fix_IsAvailableInMdxTrue.py	Implements the new fixer and its scan/apply flow against the TOM model.
src/sempy_labs/semantic_model/__init__.py	Exports the new fixer from the semantic_model package namespace.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.