Sync all reference docs with the grammar

- precedence.csv regenerated to the actual 14-level chain (postfix and
  prefix levels, guarded alternatives, definition vs assignment)
- glyph-escapes.md regenerated from the lexer: 73 glyphs, exactly one
  ASCII escape each, verified code points; M1-deferred symbols listed
  separately; add \middot so every glyph has an escape
- math_prog_lang.md: M0/M1 symbol split, canonical handler arrow, one-role
  semicolon, real precedence table and brace-disambiguation rules; the ten
  example programs are now embedded verbatim and CI-parsed
- Whitepaper (md + tex + appendices): every mpl code block parses or is
  re-fenced as an explicitly-labelled M1+ design sketch; symbol tables
  replaced by a pointer to glyph-escapes.md; unbuilt tooling and unmeasured
  claims reworded as planned/envisioned
- docs/ARCHITECTURE.md: status preamble, real grammar excerpt, planned
  sections labelled as such
- DocumentationTest now also covers math_prog_lang.md and the whitepaper
- CHANGELOG and DECISIONS.md updated

precedence.csv

@@ -1,13 +1,15 @@
 Level,Operators,Associativity,Description
-9,function application,left,Function call f(x) or f x
-8,"↯ ✎ ? ⧈ ⏲ (prefix)",right,Unary prefix operators
-7,∘,left,Function composition
-6,× ÷ ∗,left,Multiplication and division
-5,+ -,left,Addition and subtraction
-4,= ≠ < > ≤ ≥ ≈ ∼,non-associative,Comparison operators
-3,∧,left,Logical AND
-2,∨,left,Logical OR
-1,⟹,right,Implication
-0,←,right,Assignment
+11,"f(a, b)  ‧  ⊕  ⊖  ↴{…}",left,"Postfix operators: function call, qualified module access, resource alloc/release, exception handler"
+10,"↯ ✎ ⧈ ⏲ - ⇀_ch ↽_ch (prefix)",right,"Unary prefix operators (including unary minus) and channel operations"
+9,∘,left,Function composition
+8,× ÷ ∗,left,Multiplication and division (/ is an ASCII alias of ÷)
+7,+ -,left,Addition and subtraction
+6,= ≠ < > ≤ ≥ ≈ ∼,non-associative,Comparison operators
+5,∧,left,Logical AND
+4,∨,left,Logical OR
+3,⟹,right,Implication / guard arrow
+2,|,left,Guarded alternatives: (condition ⟹ result) | fallback
+1,←,right,Assignment
+0,≜,right,Definition
 -1,‖,left,Parallel composition
--2,;,left,Statement sequencing
+-2,;,left,Expression sequencing (trailing ; permitted)