feat(layout): fit_text_proportional gains an axis-specific scale override

self.scale (min(width_ratio, height_ratio)) is the right conservative
default for anything whose aspect ratio matters, but a caller whose
surrounding composition already scales along a single axis — e.g.
football-scoreboard's logo_slot = min(height, width // 2), which tracks
height alone — needs text sized the same way, or it reads as
under-scaled next to logos that grew on a panel that only got taller
(128x32 -> 128x64: self.scale stays 1.0 since width didn't grow, but
logos still double).

fit_text_proportional(..., scale=None) now accepts an explicit override;
None keeps the existing self.scale default.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/ADAPTIVE_LAYOUT.md

@@ -87,7 +87,7 @@ Built per (width, height); exposes facts and fit queries:
   at-or-below the panel's tier.
 - `fit_text(text, box, ladder, ellipsis=True)` → `FitResult` — largest rung
   that fits; ellipsizes as a last resort. Cached per (text, box, ladder).
-- `fit_text_proportional(text, box, base_size_px, ladder, ellipsis=True)` —
+- `fit_text_proportional(text, box, base_size_px, ladder, ellipsis=True, scale=None)` —
   rung closest to (not exceeding) `base_size_px * scale`, still capped to
   what fits the box. Use this instead of `fit_text` when several
   independently-fitted elements need to stay visually harmonious as the
@@ -96,7 +96,12 @@ Built per (width, height); exposes facts and fit queries:
   out of proportion to a neighbor that scales by geometry (e.g. logos
   sized via `px()`), even though each individual pick is "correct" in
   isolation. `base_size_px` is normally the element's existing classic/
-  fixed font size, so it scales in step with everything else.
+  fixed font size. `scale` defaults to `self.scale` (the conservative
+  min-of-both-axes factor `px()` uses); pass an axis-specific value when
+  the surrounding composition already scales that way — e.g. a scoreboard
+  whose logo slots track height alone (`min(height, width // 2)`) should
+  size its text by `height / design_height` too, or the text reads as
+  under-scaled next to bigger logos on a panel that only grew taller.
 - `fit_lines(lines, box, ladder, spacing)` — every line fits the width and
   the stack fits the height (measures the actual strings).
 - `font_for_rows(rows, box_h, ladder)` — largest rung whose line height

src/adaptive_layout.py

@@ -382,8 +382,9 @@ class LayoutContext:
 
     def fit_text_proportional(self, text: str, box: Union[Region, Tuple[int, int]],
                               base_size_px: int, ladder: FontLadder = LADDER_DEFAULT,
-                              ellipsis: bool = True) -> FitResult:
-        """Ladder rung closest to (but not exceeding) ``base_size_px * self.scale``
+                              ellipsis: bool = True,
+                              scale: Optional[float] = None) -> FitResult:
+        """Ladder rung closest to (but not exceeding) ``base_size_px * scale``
         that still fits the box — proportional sizing instead of ``fit_text``'s
         "always maximize" behavior.
 
@@ -396,8 +397,16 @@ class LayoutContext:
         independently "correct". ``base_size_px`` is the size that element
         renders at on the design size (``design_size``, typically 128x32)
         — commonly a plugin's existing classic/fixed font size for that
-        element, so proportional sizing tracks the same geometry scale as
-        everything else in ``px()``.
+        element.
+
+        ``scale`` defaults to ``self.scale`` (the same conservative
+        min(width_ratio, height_ratio) factor ``px()`` uses — safe for
+        content whose aspect ratio matters). Pass an explicit axis-specific
+        value when the surrounding composition already scales that way —
+        e.g. a scoreboard whose logos scale with height alone
+        (``logo_slot = min(height, width // 2)``) should size its score
+        text by ``height / design_height`` too, or its text will look
+        under-scaled next to bigger logos on a panel that only grew taller.
 
         Falls back to the smallest rung when even that exceeds the target
         (a tiny scale factor), and to fit_text's ordinary smaller-rung
@@ -405,11 +414,12 @@ class LayoutContext:
         box.
         """
         box_w, box_h = _box_dims(box)
-        key = ("text_prop", text, box_w, box_h, ladder, base_size_px, ellipsis)
+        effective_scale = self.scale if scale is None else scale
+        key = ("text_prop", text, box_w, box_h, ladder, base_size_px, ellipsis, effective_scale)
         cached = self._fit_cache.get(key)
         if cached is not None:
             return cached
-        target = base_size_px * self.scale
+        target = base_size_px * effective_scale
         eligible = [step for step in ladder if step.size_px <= target]
         candidates = eligible if eligible else (min(ladder, key=lambda s: s.size_px),)
         result = self._walk_ladder(text, candidates, box_w, box_h, ellipsis)

test/test_adaptive_layout.py

@@ -274,6 +274,20 @@ class TestFontFitting:
         second = ctx.fit_text_proportional("X", ctx.bounds, base_size_px=10)
         assert first is second
 
+    def test_fit_text_proportional_scale_override(self, font_manager):
+        # 128x64 vs design 128x32: self.scale (min of both axes) is 1.0
+        # since width didn't grow, but a caller whose composition scales by
+        # HEIGHT alone (e.g. logo_slot = min(h, w//2)) should be able to
+        # override the reference scale so text grows with it too.
+        ctx = LayoutContext(128, 64, font_manager)
+        assert ctx.scale == 1.0
+        default_fit = ctx.fit_text_proportional("17-21", ctx.bounds, base_size_px=10,
+                                                 ladder=LADDER_ARCADE)
+        height_scale = 64 / 32  # matches design height
+        scaled_fit = ctx.fit_text_proportional("17-21", ctx.bounds, base_size_px=10,
+                                                ladder=LADDER_ARCADE, scale=height_scale)
+        assert scaled_fit.size_px > default_fit.size_px
+
     def test_fit_lines_stacks_within_height(self, ctx):
         box = ctx.bounds
         lines = ["LINE ONE", "LINE TWO", "LINE THREE"]