MAINT-20 part 1 review: restore three lost lines, rewrap ragged comments

Comment, docstring and DECISIONS only (same-code script OK; python -OO
bytecode now identical for all six files).
- peakguard.charge_room_w: one-line docstring + SAFETY-125 pointer (cut whole).
- peakguard.shaping_suspended: keep 'the one place this conjunction is
  written; do not inline it'.
- price_forecast module note: an hour with no price and no yesterday is left
  out, never filled (test_price.py 14d cites the module note for it).
- Refill comment blocks the cut left ragged; DECISIONS pointers on one line.
- FCST-04 note: _yesterday_of(), not _previous_day(); FCST-03 note: the 49
  stronger cases are why the rule is a real change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bdqr7PiaHcBnzPituu2yTC

goodwe_controller/app/custom_formula.py

@@ -48,8 +48,7 @@ INDEXES: dict = {
 
 # 0.01 in the card's own units, the last digit both real cards print (Eneco
 # 15,55 vs 15.5471; ENGIE 7,522 vs 7.5218): the card's rounding and nothing
-# more.
-# DECISIONS/TARIFF-16-the-injection-leg.md.
+# more. DECISIONS/TARIFF-16-the-injection-leg.md.
 CARD_TOLERANCE = 0.01
 
 # The all-in plausibility band, EUR/kWh: the low end, where a factor-1000 error
@@ -346,8 +345,7 @@ def parse_price_formula(value, *, option: str = "price_formula"):
 
     # The card self-check still runs wherever there is a card, with the same
     # tolerance. Where the card prints no estimate, `implausible_injection()`
-    # bounds
-    # the coefficients and a startup line says the leg is ungraded.
+    # bounds the coefficients and a startup line says the leg is ungraded.
     if spec.card_graded:
         delta = card_discrepancy(spec)
         if abs(delta) > CARD_TOLERANCE: