feat(plugin): run plugin-provided commands in a worker-side application

A same-FQCN Composer\Console\Application, hand-written under the new
php/runtime/ tree, hosts CommandProvider commands inside the PHP worker:
PhpCommandProxy overrides run() and forwards the stringified input, so the
real Symfony machinery binds, validates and executes against the live
command object, while help/list render Rust-side from a definition read
back at construction. Reverse \Shirabe\RustCommandStub rows let a plugin
command invoke built-in commands back in the Rust process, keeping every
command on the side whose helper set it was written for.

Composer\EventDispatcher\Event moves from a generated stub to a dual-mode
runtime class: the real BaseCommand::initialize constructs a
PreCommandRunEvent natively in the worker, which a proxy-only constructor
guard rejected. Its PRE_COMMAND_RUN dispatch reaches a new EventDispatcher
stub whose dispatch supports the observably-no-op no-listener case and
fails explicitly otherwise. The stub generator now accepts runtime-provided
classes as stub bases (never as targets) and cross-checks the Application
handoff property table against the real class.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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