feat(acquisition): a resumed session gets its configuration back

[pskeshu]

when i resume a session, i do not have all the acquisition configuration restoration.

Two things were lost.

The run's state. The orchestrator checkpoints to timelapse.yaml every round — cadence, the DIC channel, every embryo's ending and timepoint count — and nothing ever read it back: load_state() existed with no caller. A resumed run would have restarted its numbering from whatever the conversation snapshot last said (on the rig tonight: t1, while the checkpoint said t15), over the volumes on disk. Now the checkpoint is applied on both resume paths (boot --resume and the in-app switch). The orchestrator is also pointed at the resumed session first: it learned its session once, at construction, so an in-app switch left it filing checkpoints under the previous one.

The plan. What the operator composed on Operate › Acquisition lived in the form and nowhere else, so a resumed session came back with the defaults. Now a run's plan is kept as acquisition.yaml in the session when it starts (from the pane, and from the library/agent path alike), GET /api/devices/timelapse/plan serves it back, and the pane fills its form from it on entry — once per page life, never over something the operator has already typed — and says where the plan came from. A session that predates the plan file gets one derived from the checkpoint and the last volume's sidecar, so the sessions already on the rig read back too.

Verified headless with the plan route stubbed: entering the pane fills cadence 5 min, 40 slices, 12 ms, "488 only", DIC on every 2 rounds from a pinned position at 20 ms, ending at hatching with embryo 2 at 12 timepoints, expression monitoring; the sentence says all of it; typing 33 slices then leaving and re-entering keeps 33. Seventeen tests in tests/test_acquisition_restore.py cover the store round trip, the checkpoint-derived plan, the restore helper (live run left alone, missing checkpoint not a failure), the start route keeping the plan, the plan route, and the pane's wiring.

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