Word30210/feat add option from constructor

[Word30210]

What

• Add a new from constructor to src/std/option/init.luau that returns None when the given value is nil, otherwise wraps it in Some<T>.
• Export from from the Option module.
• Add test cases for .from in tests/std/option/.spec.luau (covers both the Some and None paths, plus Option.is checks).
• Add a type-level check for Option.from in tests/std/option/.check.luau.

Why

Option.from provides an ergonomic way to lift a possibly-nil Luau value into an Option<T>, mirroring Rust's idiom of converting nullable values into Option. Without it, callers have to branch on nil manually before constructing Some/None.

Checklist

Required

• lute run ./scripts/checker.luau -- ./src ./tests ./scripts passes
• lute run ./scripts/tester.luau passes

Closes #12.

Functional Validation

• Tests cover the changed behavior (.spec.luau and/or .check.luau added or updated)
• Both happy and edge paths verified where applicable

Configuration & Docs

• User-facing docs were updated where applicable (README.md / README.ko.md / CLAUDE.md)
• New dependencies / configuration are reflected in pesde.toml / mise.toml
• No sensitive values or credentials were introduced

If Applicable

• Breaking type-surface or API changes are clearly described in this PR