fix: falsy optional reference handling - #4305
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Co-authored-by: Henry Su <henrysu4707@gmail.com>
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This pull request fixes the remaining cases around #4299 where non-
NoneOptional reference objects were incorrectly treated as absent because they were falsy.It updates runtime, resume, tracing, provider, Realtime, sandbox, and voice paths to use explicit
Nonechecks while preserving intentional empty scalar and container semantics. It also adds a deliberately narrow AST checker tomake lintthat detects direct Optional-reference truthiness mistakes before merge and conservatively excludes complex lexical forms.