fix: honor Event(internal=True) when the event is triggered

[chiliec]

Fixes #655.

Event(a.to(b), internal=True) was preserved on the declaration but never reached the queue:

• Event.__get__ built the BoundEvent without internal, so sm.go() always put on the external queue.
• StateChart.send read delay from the declared event but not internal, so sm.send("go") ignored it too.

Fix: pass internal through in __get__, and in send fall back to the declared event's internal when the caller did not pass internal=True (same precedence as delay).

Per the issue notes: dropped the "internal still has no effect at trigger time" caveat from docs/releases/3.2.2.md, added a 3.2.2 release-notes entry, and listed the declarative form in the queue table in docs/processing_model.md.

Tests

TestExplicitEvent.test_declared_internal_puts_on_the_internal_queue (parametrized over sm.light() and sm.send("light")) records the internal flag passed to the engine's put. It fails on develop for both paths ([False]) and passes with this change.

• uv run pytest: 2020 passed, 144 skipped, 44 xfailed
• uv run ruff check / ruff format --check / mypy statemachine: clean

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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