Clean up remaining stop() usage and narrow StopExecutionException #474

Summary

After web and console adapters are migrated, clean up the remaining shared control-flow primitives.

Goals

• remove or narrow remaining shared stop() usage
• remove or narrow StopExecutionException
• leave only clearly justified, narrow-purpose behavior if anything remains

In scope

• src/App/Exceptions/StopExecutionException.php
• src/App/Helpers/app.php
• any shared app helper, boot stage, or internal code still using stop()

Decision boundary

At this stage:

• if stop() still exists, it must have a narrow, explicit purpose
• if StopExecutionException still exists, it must no longer be the ordinary flow primitive for web or console

Acceptance criteria

• no leftover accidental stop() usage in migrated flows
• StopExecutionException is deleted or clearly narrowed
• shared app-layer control flow is consistent

Validation

• targeted search for remaining stop() usage
• full test suite
• static analysis