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Add a C-style call syntax:
sin(0)
sqrt(2 + 2)
backed by an evaluator-side registry, proving the path e2e. Some rules:
- A bare identifier is unchanged.
- An identifier followed by `(` parses as a call.
- Function names are only consulted in call position, so a variable
named `sin` and the `sin` function can coëxist.
- Arity is validated per function at evaluation time.
Out-of-domain calls emit an error like: offending arguments before the
reason, as in:
asin(2): argument must be in [-1, 1]
atan2(0, 0): undefined at the origin
The reason text is mapped from the upstream `reals` errors to our own.
Re-send SIGTERM on a short interval until the command exits, so a dropped or late delivery self-corrects instead of failing.
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