docs: README and polyscript package-doc examples call New() without the required ctx argument (won't compile)

[robbyt]

Summary

The constructor signature is New[E Engine](ctx context.Context, src Source, opts ...Option[E]), but every New example in README.md and three examples in the polyscript.go package doc omit the leading ctx. Copied verbatim, they do not compile. The direct-subpackage examples similarly omit ctx from FromRisorLoader/FromExtismLoader, whose signatures also take ctx first. The New godoc itself (polyscript.go:226-232) shows ctx correctly, so the package is internally inconsistent.

Locations

README.md — New examples

Line	Call
68	New[polyscript.Risor](FromString(script), WithStaticData...) (quick start)
118	New[polyscript.Risor](FromFile(...))
149	New[polyscript.Risor](FromLoader(httpLoader))
164	New[polyscript.Risor](FromString(script), WithLogHandler..., WithStaticData...)
180	New[polyscript.Risor](FromString(script), WithStaticData...)
191	New[polyscript.Risor](FromString(script))
226	New[polyscript.Risor](FromString(script), WithStaticData...)
281	New[polyscript.Starlark](FromString..., WithStaticData...)
304	New[polyscript.Extism](FromBytes..., WithEntryPoint..., WithStaticData...)

README.md — direct-subpackage examples

• 336 — risor.FromRisorLoader(ldr, risor.WithStaticData(...)) (actual: FromRisorLoader(ctx, ldr, opts...))
• 356 — extism.FromExtismLoader(wasmLdr, extism.WithEntryPoint(...), ...) (actual: FromExtismLoader(ctx, ldr, opts...))

polyscript.go — package doc

• 13 — New[polyscript.Risor](polyscript.FromString(script))
• 21-24 — New[polyscript.Risor](FromString(script), WithStaticData...)
• 28-31 — New[polyscript.Extism](FromBytes..., WithEntryPoint...)

Why CI didn't catch it

readme_test.go passes t.Context() as the first argument to every New call (lines 34, 70, 97, 139, 172, 192), so the tests compile and pass. They validate the snippets' logic, not the exact source shown in the README, so the drift is invisible.

Fix

Prepend ctx (context.Background() in README prose, ctx/t.Context() where a context is in scope) to every listed example. Consider generating README snippets from compiled example files to keep them honest.