umputun / spot / 21006467772

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fix: use word-boundary matching for $VAR environment variable expansion

$VAR format now only matches when not followed by identifier characters
[a-zA-Z0-9_], preventing unintended replacements like $SUBNET matching
inside $SUBNET_ID.

Also fixes flaky timing test and prealloc linter warnings.

Related to #326

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3067 of 3657 relevant lines covered (83.87%)

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