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repl: rename --engine pvml/pvml-browser to pynter/pvml, add py2js and wasm (#432)

The CLI's --engine values didn't match how the team refers to these
engines day to day: "pvml" meant the native-Pynter-binary path and
"pvml-browser" meant the pure-TypeScript PVMLInterpreter path, which
reads backwards once you're running everything under Node rather than
in a browser. Renamed so --engine pvml is now the pure-TS interpreter
and --engine pynter is the native binary (the name alone implies
running under Node, no "-browser" qualifier needed for the other one).

Also exposes two previously CLI-inaccessible engines through the same
flag: py2js (compiles to JS and runs it directly — this year's
workhorse evaluator) and wasm (compiles to an actual WebAssembly
module). Wiring up wasm surfaced a real bug in that engine's
non-interactive/file-evaluation mode (source-academy/py-slang#431): a
top-level print() of a string that isn't a program's last statement
breaks every subsequent statement. Left --engine wasm in place with
the bug documented rather than gating it out, since PyWasmEvaluator's
own evaluateFile path has the same defect independent of this CLI.


Claude-Session: https://claude.ai/code/session_01F89Hy349FaKSQh3NpbFvAx

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

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