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v1.20.2.0
9f358cab · ·v1.20.2.0 — condensed reference, added ExecutionContext, WaitGroup, ThreadLocal, ClosedError * Condensed ~2500 lines across all sections and skills * Added Fiber::ExecutionContext hierarchy, WaitGroup, @[ThreadLocal], Channel::ClosedError * Softened .not_nil! mandate (now permits in hot paths where nil already checked) * Updated all hardcoded version URLs to /latest/ * Updated source path to /usr/share/crystal/src/ * Merged c-bindings-ffi.md + time-v1-20.md into stdlib.md * Condensed 17-references.rst to official Crystal resources only * Condensed 13-project.rst by 216 lines (removed verbose scaffolding) * Aligned agents/gemini/crystal/ skill with ~/.gemini/skills/crystal/