Version 0.16.6

Bug Fixes

lager battery <net> tui now works for the first time. The OLD WebSocket battery monitor crashed at module load with ImportError: cannot import name '_resolve_net_and_driver' from 'lager.power.battery.dispatcher' — that symbol existed at module level only in the supply dispatcher, never the battery one. Nobody had reported the bug because nobody had tested the battery TUI before. Incidentally fixed by the VISA-ownership unification below; the battery monitor now also emits a battery_driver_ready event mirroring supply_driver_ready for client symmetry.
Concurrent SCPI access on the same instrument now serializes correctly. Two /invoke requests against the same cached driver in box/lager/hardware_service.py could race on the SCPI bus and produce Query INTERRUPTED pyvisa errors. Added a per-(device_name, address) lock that wraps every driver call. Multi-channel devices (e.g., Rigol DP821) correctly share one lock since they share one VISA session.

VISA session ownership unified. The supply and battery WebSocket monitors no longer open their own pyvisa sessions in monitor threads. They now route every driver call through hardware_service.py:/invoke via the existing Device HTTP proxy. hardware_service.py (port 8080) is the sole owner of pyvisa sessions per (device_name, address). The v0.16.5 POST /cache/clear band-aid is removed — this is the architectural fix that replaces it. Net effect: TUIs are more robust, no longer trip on stale cached sessions, and Query INTERRUPTED errors during simultaneous TUI + CLI activity are gone.
Battery handlers consolidated. ~670 lines of duplicate battery-handler code in box/lager/box_http_server.py (parallel to the modular box/lager/http_handlers/battery.py) were deleted. box_http_server.py now imports and registers the modular versions, matching what was already done for supply.
Test hygiene. Two unit tests in test/unit/cli/test_performance_improvements.py had been silently failing since the .lager config format was migrated to JSON-only. Tempfiles now use {"LAGER": {...}} JSON; full unit suite is back to 141/141 passing.

To install this version:

pip install lager-cli==0.16.6

To upgrade from a previous version:

pip install --upgrade lager-cli