Collections omissions

[adh]

No description provided.

[Copilot]

Pull request overview

This PR fills in missing collection APIs in ListTalk by adding filter, asVector, size/empty?, and a set of iterator combinators (including a new lazy FilterIterator) along with corresponding tests to prevent regressions.

Changes:

• Added List>>filter: and LT_List_filter, plus List>>asVector conversion.
• Added Set>>size and Set>>empty?.
• Extended Iterator with asIterator, map:, filter:, forEach:/do:, any:, every:, inject:into:, reduce:, and introduced FilterIterator with VM binding.
• Added/expanded tests for the above behaviors (including laziness/consumption semantics).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/eval-objects.lt	Adds a regression test for Vector>>asVector returning the receiver.
tests/eval-collections.lt	Adds coverage for list filtering, list-to-vector conversion, set size/emptiness, and iterator combinators (including lazy map/filter and consuming operations).
src/vm/base_env/base_env.c	Registers FilterIterator in the native class bindings so it’s available in the base environment.
src/classes/Vector.c	Implements Vector>>asVector as an identity conversion and registers the method.
src/classes/Set.c	Implements and registers Set>>size and Set>>empty?.
src/classes/List.c	Adds LT_List_filter, List>>filter:, and List>>asVector (with vector allocation/fill).
src/classes/Iterator.c	Adds iterator combinators on Iterator and introduces the FilterIterator class implementation.
ListTalk/classes/List.h	Exposes LT_List_filter in the public list API.
ListTalk/classes/Iterator.h	Declares the new LT_FilterIterator class and constructor.

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