Diagnostic when FormattableStringFactory is missing should mention platform version

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Description

This issue does not include a description.

Contributor guide

Research direction

Investigate the FormattableStringFactory class and its usage in diagnostics. Look for where platform version is used and determine if an improved error message is needed.

Tech stack

csharp

Domain

compilers

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Fresh

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Needs investigation

Prerequisites

GitC#

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

30