v0.5.0

v0.5.0 (2026-10-07)

• Mixed-line evaluation: prose lines whose words strip to a
  complete expression answer with it - 50 apples at 3 each is
  150, 2 coffees plus 1 tea is 3. Word operators map
  (at/of/times multiply, plus adds, minus subtracts),
  unknown names drop as prose, and failures stay silent: mixed
  lines never grow error cells. spec.md gained the Mixed lines
  section; the tour demos the shape.
• Multi-clause functions with literal-pattern matching: fact(0) = 1
  and fact(n) = n * fact(n - 1) make recursive functions work -
  clauses with literal parameters match before variable ones, and
  redefining a clause replaces its predecessor (like variables).
  Forward line references: &N pointing below or at a not-yet-
  answered line is blank (no cell) instead of erroring - the line
  fills in when the target produces a value. spec.md gained the
  Mixed lines section and the Functions recursion-and-clauses
  clause; the tour gained a Recursion section.