Add lazy collection creation from closure and enhance collection methods.

[gustavofreze]

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[Copilot]

Pull request overview

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Adds support for creating lazy collections from a closure (enabling safe re-iteration) and adjusts pipeline/collection behavior accordingly, with expanded test coverage and repo metadata updates.

Changes:

• Introduces Collection::createLazyFromClosure() backed by LazyPipeline::fromClosure() for re-iterable lazy sources.
• Refactors EagerPipeline to memoize materialization and allow repeated iteration when created from single-use iterables (e.g., generators).
• Updates each() to be a terminal operation returning void, and updates tests + adds new tests for closure/generator reiteration.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 15 comments.

Show a summary per file

File	Description
src/Collection.php	Adds createLazyFromClosure() and changes each() to return void.
src/Collectible.php	Extends public interface with createLazyFromClosure() and updates each() contract.
src/Internal/LazyPipeline.php	Supports closure-based sources by invoking factory per iteration.
src/Internal/EagerPipeline.php	Switches to staged processing with memoized materialization for reiteration.
src/Internal/Operations/Transforming/Rearrange.php	Minor formatting adjustment in match arm.
tests/LazyCollectionTest.php	Updates each() tests and adds closure-backed lazy collection tests.
tests/EagerCollectionTest.php	Adds generator reiteration test and updates each() usage.
tests/CollectionTest.php	Adds parity tests comparing closure/lazy/eager behavior and type preservation.
.gitattributes	Adds LF normalization, diff drivers, and updates export-ignore rules.
.claude/*	Adds documented rules for testing, code style, workflows, and documentation.

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