Test shared() async results against #[On] listeners

[simonhamp]

Follow-up to #228. These were written while #228 was open but weren't pushed before it merged.

Testing shared() in the super-native demo app crashed the screen. The demo's #[On] handler took a single $event argument. But #[On] methods get payload keys bound to their parameter names, and the shared() payload has id, result and status keys. There is no event key, so the call failed. The framework was right. The demo and the docs page had the wrong signature.

The existing shared() test didn't catch it because it used an ->on() closure listener, and closures get the whole payload as one object.

This adds two tests that send a shared() result to a real #[On] method, one for a finished task and one for a failed one. The failure payload has no result key, so that test also shows why every parameter needs a default. The Boost docs index now mentions the name binding too.

One thing that changed since #228: #[On] calls now go through ComponentMethodInvoker, so a $event handler fails with a BindingResolutionException instead of the ArgumentCountError we saw on device. I checked that both new tests fail with the bad signature.

No source changes. Full suite passes locally (1165 tests).

🤖 Generated with Claude Code

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