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Elior Nataf Lackritz
3be96b7d73
Now that a forced snapshot mints a version for a never-written channel, the first checkpoint a forked run writes seals every delta channel, so _delta_channels_awaiting_fork_snapshot never outlived it. Seed _delta_channels_forced_snapshot directly at loop construction instead. Also asserts that forking by invoke leaves the abandoned branch's reads intact, and trims comments and test docstrings.