Prevents timer accumulation in long-running loops:
- restart_context.go: poll loop uses NewTicker instead of time.After
- supervised.go: backoff sleep uses NewTimer with proper Stop
- telegram.go: poll loop uses NewTimer for both retryAfter and poll interval
Each time.After created a timer that couldn't be GC'd until it fired.
In long-running goroutines this caused bounded but unnecessary memory
growth.
Molecule AI Dev Engineer A (Kimi)
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