Merge release/1.0 (e3e4ba6) into opt15-price-run-fixes

Conflicts (5 files, 9 hunks) resolved keeping both sides:
- p1.py: held_t (OPT-15) beside held_since (SAFETY-90).
- modetrade.py: chargers() takes targets (P4) and probe (OPT-15); decide()
  clears the chargers, a probing refuser included, while a battery drains
  (SAFETY-78); the docstring lists both rules.
- main.py: the roll goes into the SAFETY-90/91 projection chain
  (`_peak_proj`); the SAFETY-95 drain-tail grid_w keeps the run-edge hold on
  its other branch; the P4 forecast state and the hold state both stay.
- DOCS.md, DECISIONS: both lines kept, OPT-15 item refreshed.

Adaptations the merge needs:
- SAFETY-81 x F1: a rolled projection is not graded by the saturation alarm
  until the quarter's first sample, as the old edge tick was not, so a
  standing overload is still notified once per quarter.
- test_safety81, test_modes_p4: modes-on pins re-pinned (with a note), modes
  off pinned to e3e4ba6; test_price_run_fixes: identity pins on e3e4ba6,
  F1 reproduced at one inverter (SAFETY-91 already holds two), tests for the
  drain and the day plan against the probe.

Co-Authored-By: Claude <noreply@anthropic.com>

goodwe_controller/app/tariff.py

@@ -835,6 +835,22 @@ class PeakTracker:
             held_w=averager.held_net_w)
 
 
+def next_quarter(p: Projection, max_hold_s: float) -> Projection:
+    """SAFETY-91: `p` past its block's end, before the next block's first
+    telegram: the next quarter, projected from the held reading (the averager
+    credits it there). `p` itself otherwise, or when that reading is too old
+    to be credited. DECISIONS/SAFETY-91-held-battery-last.md."""
+    if p.block_start is None or p.elapsed_s < QUARTER_S \
+            or p.elapsed_s * (1.0 - p.covered_frac) > float(max_hold_s):
+        return p
+    held = max(p.held_w, 0.0)
+    return Projection(projected_w=held, elapsed_w=held,
+                      elapsed_s=p.elapsed_s - QUARTER_S, covered_frac=1.0,
+                      complete=True,
+                      block_start=p.block_start + timedelta(seconds=QUARTER_S),
+                      held_w=p.held_w)
+
+
 @dataclass(frozen=True)
 class _ClosedBlock:
     """A block reconstructed from a checkpoint. Shaped like `p1.QuarterBlock` so