#206 Fix: [for cherry-picking] Updated the public SemanticModel value lookup

Fixed Findings

• Filter class members from semantic value lookup

Automated fix from agentic review of https://github.com/metaphorics/bamTiScript/pull/205

Summary by Sourcery

Bug Fixes:

• Restrict semantic value lookup from returning class members unless the requested symbol is itself a class.

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Summary by cubic

Fixes semantic value lookup so it no longer returns class members when the requested symbol isn't a class.