Typed arguments, calculated tables, spans, closed-world fonts, top-level fnt/ and env/

Sync with klammertext-dev through b90b0e09:

- Argument types end to end: :python_cast values are applied (Python
  @eval receives real bools/numbers/lists), argument values are
  validated against their argtype patterns with the argtype's
  description as the error message, argtypes can declare :default
  (overridable per declaration), and parameterized type families are
  supported: rest(N) casts a rest argument to an N-dimensional list
  (bar-count = dimension).
- Unified indexed_range syntax (selector with parenthesized subsets,
  composable mnemonic names) for table lines and spans.
- Table klammer: caption fonts fixed in both targets, :column_width /
  :leading / :colsep wired, :colspan and :rowspan render (HTML
  attributes; \multicolumn / \multirow), calculated cell values (:calc)
  with prefix operators, display-precision semantics, :calc_format and
  :decimal period|comma.
- Fonts: closed-world resolution on the Klammertext font store
  (infrastructure in mac/font_store; no Google Fonts links or fetch).
  Default fonts live in the top-level fnt/; additional fonts install
  into KLAMMERTEXT_FONTS directories via kdesc --font (list, samples,
  preview, install — classification by font metadata).  CSS font family
  names are quoted (digit-initial families were silently lost).
- Environment files moved from mac/env/ to the top-level env/; shell
  profiles source env/runtime.env.  Dead per-host variants removed.
- Container: fnt/ ships in the image; curl removed (no network use).

sks/target/latex_util.py

@@ -73,9 +73,8 @@ def make_caption_text(number, label, text, font_symbol, font_size):
         # caption = text   # f"{{\\small \\it \\par {caption_text}}}"
         caption = text
 
-    font_symbol = "r"
-    font_size = 1.2
-
+    if caption is None:
+        return ""
     caption = font.tex_fontify(caption, font_symbol, font_size)
     return caption
 
@@ -108,9 +107,9 @@ def add_caption(element, caption_label, number, caption_text, latex_width,
                                # minipage(caption),
                                latex_width, vertical="t")
         elif side == "top":
-            element = minipage(caption + "\n" + element,
-                               # minipage(caption, vertical="t") +
-                               # caption_margin + "\n" +
-                               # minipage(element),
+            # A depth strut: the bottom-caption case uses \vstrut (height)
+            # above the caption; a top caption needs the mirror image,
+            # space below its line.
+            element = minipage(caption + "\\rule[-0.75\\baselineskip]{0pt}{0pt}\n" + element,
                                latex_width, vertical="t")
     return caption_wrapper(element, hpos)