Fix race conditions, memory leaks, and performance issues in lazy-define#337

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Copilot wants to merge 9 commits intomainfrom

copilot/fix-performance-issues-lazy-define

Commits on Feb 17, 2026

Initial plan
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Initial plan for lazy-define performance and correctness fixes

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mattcosta7
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Fix multiple performance and correctness issues in lazy-define.ts

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Address code review feedback

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Copilot
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Fix memory leak in visible() function

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Fix all lazy-define performance and correctness issues with tests

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mattcosta7
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Address code review feedback - improve naming and fix race conditions

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mattcosta7
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Final fixes: prevent observedTargets race condition and cleanup properly

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mattcosta7
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Address final code review feedback - improve comments and test mocking

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mattcosta7
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