A daemon restart used to abandon in-flight downloads: the in-memory queue was
lost and the web doesn't re-dispatch a stuck task, so the user had to retry
manually. The bytes already persisted (mmap + anacrolix's piece-completion DB
keyed by info_hash; debrid via Range; usenet via its tracker) — the daemon just
didn't re-attempt the work.
ActiveTaskStore persists each in-flight download's agent.Task payload to
active-tasks.json; the daemon re-submits them on startup so the downloaders
resume the partial data. manager.Submit now dedups (the startup re-submit and a
later web re-dispatch can't both run), and recordFinished removes a task from
the store only on a genuine terminal — shuttingDown (set before Shutdown cancels
the task contexts) keeps shutdown-interrupted tasks so they resume next start.
Stream/seed/upgrade tasks aren't persisted; ForceStart is cleared on resume.
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