snapshot_history.py — async periodic capture per instance:
interval_sec / keep_last (FIFO eviction) / dir configurable
GET /snapshots/{instance}?limit=N → list metadata
GET /snapshots/{instance}/{filename} → image bytes
Persisted в /var/lib/cuda-grid/snapshots/{instance}/<ts>.png
layout_map / layout_filter_target в InstanceCfg — для будущей runtime switch
архитектуры (через streamselect либо filter rework — выбор за Phase 7).
Текущий _set_layout dispatches к layout_filter_target c index из map.
UI:
+ Layout buttons (quad/single/main_plus_preview placeholder)
+ Snapshot history grid с thumbnails (loaded /snapshots/{inst}?limit=24)
+ "Reload history" button
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
gx
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