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).

mac/state.h

@@ -15,12 +15,14 @@ class Var
 public:
     Var() = default;
     Var(std::string name, std::string value=klammerstate::no_value,
-        std::string delim=":", std::string desc="", Locator loc=Locator())
+        std::string delim=":", std::string desc="", Locator loc=Locator(),
+        Argtype argtype=Argtype())
         : m_name(name)
         , m_value(value)
         , m_delim(delim)
         , m_desc(desc)
         , m_loc(loc)
+        , m_argtype(argtype)
         {};
     bool defined();
 
@@ -29,6 +31,7 @@ public:
     std::string m_delim {};
     std::string m_desc {};
     Locator m_loc {};
+    Argtype m_argtype {};
 };
 
 namespace klammerstate {
@@ -44,7 +47,8 @@ public:
 
     std::vector<std::string> names() const;
     void set(std::string name, std::string value,
-             std::string delim=":", std::string desc="", Locator loc=Locator());
+             std::string delim=":", std::string desc="", Locator loc=Locator(),
+             Argtype argtype=Argtype());
     std::pair<Var, bool> get(std::string name);
 
     std::string m_name {};
@@ -58,8 +62,11 @@ public:
     void open_frame(std::string name);
     void close_frame();
     void set(std::string name, std::string value, bool update=false,
-             std::string delim=" ", std::string desc="", Locator loc=Locator());
+             std::string delim=" ", std::string desc="", Locator loc=Locator(),
+             Argtype argtype=Argtype());
     void set(std::map<std::string, std::string> varmap);
+    void set(const std::map<std::string, std::string>& varmap,
+             const Parameter_set& parameters);
     void replace(std::string name, std::string value, bool error_if_not_defined=true);
     void add_environment_frame();
     Var get(std::string name, bool error_if_not_defined=false, Locator loc=Locator());