feat: drain-on-Stop and NewTicker primitive#4

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klaidliadon wants to merge 17 commits intomasterfrom

feat/drain-and-ticker

Commits on May 1, 2026

Commits on May 2, 2026

fix: preserve drain semantics under concurrent Stop
klaidliadon
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docs(examples): exit promptly when worker dies before signal
klaidliadon
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fix: snapshot runCancel under mutex to avoid cancelling a future Run
klaidliadon
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fix: WithRetry stops retrying after WithDrain's Stopping fires
klaidliadon
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test: replace vacuous round-2 test with same-runnable Run/Stop/Run
klaidliadon
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test: rename round-2 test, drop unfounded snapshot-coverage claim
klaidliadon
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fix(retry): scope lastTime per Run cycle, drop the struct field
klaidliadon
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test: drop vacuous "retry budget is per-Run-cycle" test
klaidliadon
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