refactor!: Make `Actor` initialization stricter and more predictable #677

Job	Run time
Type check / Type check (3.10)	23s
Type check / Type check (3.11)	25s
Lint check / Lint check (3.12)	10s
Lint check / Lint check (3.11)	10s
Lint check / Lint check (3.10)	10s
Docs check / Docs check	1m 7s
Lint check / Lint check (3.13)	10s
Unit tests / Unit tests (ubuntu-latest, 3.13)	29s
Integration tests / Integration tests (3.13)	10m 41s
Unit tests / Unit tests (ubuntu-latest, 3.10)	21s
Unit tests / Unit tests (ubuntu-latest, 3.11)	23s
Integration tests / Approve integration tests for PRs from forks	8m 7s
Integration tests / Integration tests (3.10)	9m 36s
Unit tests / Unit tests (windows-latest, 3.13)	49s
Unit tests / Unit tests (windows-latest, 3.12)	43s
Unit tests / Unit tests (windows-latest, 3.10)	52s
Unit tests / Unit tests (windows-latest, 3.11)	49s
Unit tests / Unit tests (ubuntu-latest, 3.12)	27s
Type check / Type check (3.12)	29s
Type check / Type check (3.13)	29s
Integration tests / Integration tests for PRs from forks	0s
	36m 50s

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