Fix POP01 encoding bug + harden grid-cal revert verification

Root cause of the grid-calibration auto-revert silently failing: lvx-control
and flash.py encode output_priority solar_battery_utility as "POP01", but PI18
POP is single-digit — the inverter silently rejects "POP01" (raw "POP1" works,
matches the POP_PIRI decoder). Compounded by powermon's adhoc queue wedging,
which dropped commands entirely until a restart. So the monitor logged "revert
done" while the cluster sat in SUB/grid mode for ~1.5h (no harm: battery full,
just running loads on grid).

- lvx-control + flash.py: POP_MAP "01" -> "1" (also patched the live
  /usr/local/bin/lvx-control + restarted; verified it now emits POP1).
- grid-cal-monitor: revert now VERIFIES via behavior (line_power_direction
  leaves 'input'), and on failure restarts powermon and re-sends raw POP1/PCP0,0,
  with a loud manual-fallback message. No more trust-the-publish.

Recovery for the live run: restarted powermon (unstuck adhoc) + raw POP1 + PCP0,0;
confirmed POP=Solar-Battery-Utility, PCP=Solar First, mode=Battery, line_dir=donothing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

LVX6048/lvx-control/lvx-control

@@ -44,7 +44,7 @@ ADHOC_TOPICS = (
 # Intentionally a strict subset of flash.py's SCHEDULE — only the safe,
 # day-to-day knobs. The risky-end calibration setters live in flash.py.
 
-POP_MAP = {"solar_utility_battery": "0", "solar_battery_utility": "01"}
+POP_MAP = {"solar_utility_battery": "0", "solar_battery_utility": "1"}  # PI18 POP is single-digit; "01" is malformed -> inverter silently rejects (confirmed 2026-06-25, broke a calibration auto-revert)
 PCP_MAP = {"solar_first": "0", "solar_and_utility": "1", "solar_only": "2"}
 PSP_MAP = {"battery_load_utility_ac": "0", "load_battery_utility": "1"}
 ALLOWED_MCHGC = (10, 20, 30, 40, 50, 60, 70, 80)