test: cover multi-level actor supervision propagation

[cappallo]

Summary

• add SupervisorNoHandler and RootSupervisor actors to the supervision example to exercise multi-level failure bubbling
• add a regression test that ensures ChildFailed notifications reach ancestors when intermediate supervisors omit a handler
• refresh STATUS.md with the new example coverage and updated totals

Testing

• npm run build --silent
• npm test --silent

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Codex Task

[Copilot]

Pull Request Overview

This pull request enhances the actor supervision example by adding multi-level supervision hierarchy testing. The changes add two new actor types (SupervisorNoHandler and RootSupervisor) and a regression test to verify that ChildFailed notifications correctly propagate through supervisors that lack failure handlers.

Key Changes

• Added SupervisorNoHandler actor: an intermediate supervisor that forwards messages but lacks a ChildFailed handler
• Added RootSupervisor actor: a top-level supervisor with failure tracking that spawns SupervisorNoHandler
• Added failure_propagates_without_intermediate_handler test: validates failure propagation across multiple supervision levels
• Updated STATUS.md with new test coverage documentation

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
examples/actor_supervision.lx	Adds two new supervisor actors and a test to verify multi-level failure propagation when intermediate supervisors omit ChildFailed handlers
STATUS.md	Updates documentation with the new test coverage and incorrectly increments example file count

[Copilot]

The example file count appears to be incorrect. This PR adds new actors and tests to the existing examples/actor_supervision.lx file but doesn't add any new example files. The count should remain at 36 example files (27 runnable + 9 error test cases), not increase to 37 (28 runnable + 9 error test cases).

Suggested change

	The implementation successfully runs 37 example files (28 runnable + 9 error test cases) including:
	The implementation successfully runs 36 example files (27 runnable + 9 error test cases) including: