fix: make signal handlers async-signal-safe#25

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rmorgans wants to merge 6 commits intomobydeck:mainfrom

rmorgans:fix/signal-safety

Commits on Mar 14, 2026

fix: retry partial writes in packet and push paths

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fix: use write_all in send_kill (missed in initial fix)

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fix: treat write()=0 as failure, add regression tests

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Commits on Mar 15, 2026

fix: make signal handlers async-signal-safe and handle blocked writes

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claude
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test: add forkpty-based signal safety integration tests

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chore: ignore *.dSYM directories in .gitignore

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