fix: register one event per id a prefixed attribute expands to

[fgmacedo]

Why

_expand_event_id("error_foo") returned the glued string "error_foo error.foo" and the chart registered 1 event under it instead of 2, so sm.error_foo(), allowed_events and enabled_events() were broken for every error_ / done_state_ / done_invoke_ attribute (#654, question 1 of #644).

Fixes #654. Also fixes question 1 of #644 (left open for its question 2).

What changes

• A prefixed attribute registers 2 events, the attribute name and its dotted form, each bound as a class attribute and callable as a method: sm.error_foo() runs the transition instead of raising TypeError (bare) or doing nothing (Event(...)).
• allowed_events and enabled_events() list both ids instead of raising AttributeError on error.execution, on both engines.
• name, delay and internal declared on an Event(...) inside a nested state body are kept on both ids instead of dropped.
• The @source.to(target) decorator form expands too; it registered only the attribute name before.
• from_.any() with a prefixed name copies its transition once per state carrying both ids, instead of once per id (one diagram edge per state, callbacks registered once).
• A chart with an Event(...) attribute plus a "*" transition builds instead of crashing with ValueError: list.remove(x); placeholders are now found by membership, not by the prefix matcher.

Evidence

Before, on origin/main, with the ErrorLogger chart from #644:

events: ['process', 'error_execution error.execution']
enabled_events: AttributeError 'ErrorLogger' object has no attribute 'error.execution'
error_execution(): TypeError TransitionList only supports the decorator syntax to register callbacks.

After:

events: ['process', 'error_execution', 'error.execution']
enabled_events: ['process', 'error_execution', 'error.execution']
error_execution(): {'failed'}

$ timeout 120 uv run pytest -n 4 --cov=statemachine --cov-branch
TOTAL                                                 6093      0   1898      0   100%
2543 passed, 25 skipped, 44 xfailed, 9 warnings in 25.22s
$ uv run ruff check . && uv run mypy --namespace-packages --explicit-package-bases statemachine/ tests/
All checks passed!
mypy: No issues found

New tests: tests/test_expanded_event_ids.py (3 prefixes x 4 declaration forms x top-level/nested, sync and async, plus from_.any()), 2 cases in tests/test_events.py, and the inverted test_expanded_id_keeps_the_declared_arguments_on_both_ids. Run against the origin/main package, 109 of the new cases fail for the reported reasons.

Not verified

• MachineMixin / Django models with prefixed events (no code path there touches registration, but not exercised).
• An Event() placeholder referenced from inside a nested state body is still not replaced (_update_event_references walks only top-level states); pre-existing, skipped in the new tests with that reason.
• on_error_execution naming convention still only fires for a trigger literally named error_execution, not for the engine-raised error.execution; pre-existing, left for a follow-up.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b6bf8ca) to head (7ccf95f).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #675   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           52        52           
  Lines         5672      5685   +13     
  Branches       891       896    +5     
=========================================
+ Hits          5672      5685   +13     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

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