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/image/image_grid.py

@@ -25,11 +25,16 @@ class Kargs:
         self.K_input_filenames = K.K_input_filenames
         self.K_output_dir = K.K_output_dir
         self.K_output_basename = K.K_output_basename
-        self.image_output_dir = K.Image_output_dir
+        self.Image_output_dir = K.Image_output_dir
         self.K_toc_only = False
         self.id = ""
         self.as_string = False
         self.rel = None
+        # Defaults for @image parameters the grid does not use per cell.
+        self.border = False
+        self.vmargin = False
+        self.abswidth = 0.0
+        self.caption_font_size = .9
 
 def img(K, target, basename, caption, width):
     result = image.Image(
@@ -46,7 +51,7 @@ class Image_grid(klammer_base.Klammer_base):
         self.basenames = []
         self.captions = []
 
-        for row in kutil.rest_args(self.image_specs, dimensions=2):
+        for row in self.image_specs:
             self.images.append(
                 [e.groups() for e in [image_pat.fullmatch(s.strip()) for s in row]])
             self.basenames.append([e[0] for e in self.images[-1]])