feat: allow cli container injection

[ChiragAgg5k]

Summary

• allow injecting a container when constructing CLI
• expose the current container with getContainer()
• add coverage for using a provided container for task injections

Testing

• composer test
• composer lint
• composer check

[greptile-apps]

Greptile Summary

This PR allows callers to inject a pre-built Container into the CLI constructor (or via setContainer()), and exposes the current container through a new getContainer() accessor. The injected container becomes the parent of an internally-managed child container, so resources defined on it are inherited, but the CLI's own runtime resources remain isolated and are cleared on reset().

• CLI::__construct() gains an optional ?Container $container parameter; when provided it is stored as $parentContainer and used to seed new Container($container)
• getContainer(): Container is added as a new public accessor returning the internal child container
• setContainer() gains a proper Container type hint (previously untyped) and now wraps the given container in a child container, consistent with the constructor behaviour
• reset() is updated to reconstruct $this->container from $this->parentContainer, so parent-injected resources survive resets while runtime additions do not
• Two new tests cover container isolation (assertNotSame) and post-reset resource availability

Confidence Score: 5/5

PR is safe to merge — changes are additive, well-tested, and backward compatible

All new parameters are optional with null defaults so existing callers are unaffected. The child-container pattern is applied consistently across the constructor, setContainer, and reset. Two targeted tests verify the new behaviour. No P0 or P1 issues found.

No files require special attention

Important Files Changed

Filename	Overview
src/CLI/CLI.php	Adds optional Container injection to constructor, getContainer() accessor, proper type hint on setContainer(), and updates reset() to preserve the parent container
tests/CLI/CLITest.php	Adds two targeted tests covering child-container isolation and post-reset resource preservation

_{Reviews (2): Last reviewed commit: "Reapply "fix: preserve injected containe..." | Re-trigger Greptile}