Fix SoC balance on battery export and improve evening push (v39).

SoC continuity now deducts only bd (ge_bat was double-counted via energy
balance), which stopped the plan from draining ~2× faster than BMS during
evening BATTERY_SELL. Also ships dynamic evening push budget + rolling
hysteresis (v38), drops unused fn_soc_tracking_bundle, and adds tests/docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

db/routines/R__091_fn_soc_tracking_bundle.sql

@@ -0,0 +1,10 @@
+-- Odstraněno v39: kalibrace discharge_calibration_factor nahrazena opravou SoC bilance (jen bd, ne bd+ge_bat).
+
+drop function if exists ems.fn_soc_tracking_bundle(
+  int,
+  timestamptz,
+  numeric,
+  numeric,
+  numeric,
+  numeric
+);