Files
sx/examples
agra aa1aa63bb3 ERR/E1.4a: standalone try sema + pure-failable propagation + named widening
`try f()` (standalone form) now propagates a failable callee's error to the
enclosing failable function. E1.4 was split: E1.4a = standalone try (failure
target = function-propagation); E1.4b = fallback-target routing +
failable-`or` + whole-program SCC for inferred sets + empty-inferred warning.

- lowerExpr: `.try_expr` -> lowerTry
- lowerTry: (1) try legal only inside a failable fn; (2) the sole
  failable-operand check (errorChannelOf(inferExprType(operand))); (3)
  named-caller widening (checkErrorSetSubset at the propagation site); (4)
  pure-failable lowering — condBr on tag != 0: propagate (run defers + ret
  the widened tag) vs continue on success
- inferExprType: `.try_expr` arm (success type: void for pure-failable)
- lowerBinaryOp .or_op: bail loudly on a failable LHS (exprIsFailable);
  the optional-`or` path is unchanged for non-failable LHS
- value-carrying callee/caller `try` bail loudly (pending E2's tuple ABI)

Tests: examples/221-try.sx (positive propagation, exit 5),
examples/222-try-rejections.sx (3 stable rejections: outside-failable,
non-failable operand, named-widening miss; exit 1). Gates: zig build,
zig build test, 260/260 examples.
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