refactor!: Make `Actor` initialization stricter and more predictable #729

Job	Run time
Docs check / Docs check	1m 0s
Type check / Type check (3.10)	22s
Lint check / Lint check (3.10)	10s
Type check / Type check (3.11)	18s
Type check / Type check (3.12)	23s
Unit tests / Unit tests (ubuntu-latest, 3.10)	25s
Unit tests / Unit tests (ubuntu-latest, 3.11)	26s
Lint check / Lint check (3.13)	14s
Lint check / Lint check (3.12)	11s
Unit tests / Unit tests (windows-latest, 3.11)	53s
Type check / Type check (3.13)	23s
Unit tests / Unit tests (windows-latest, 3.10)	1m 13s
Unit tests / Unit tests (windows-latest, 3.12)	55s
Unit tests / Unit tests (ubuntu-latest, 3.12)	29s
Unit tests / Unit tests (ubuntu-latest, 3.13)	26s
Integration tests / Integration tests (3.10)	9m 46s
Lint check / Lint check (3.11)	11s
Integration tests / Approve integration tests for PRs from forks	3m 10s
Unit tests / Unit tests (windows-latest, 3.13)	1m 18s
Integration tests / Integration tests (3.13)	10m 53s
Integration tests / Integration tests for PRs from forks	0s
	33m 6s

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