refactor!: Make `Actor` initialization stricter and more predictable #721

Job	Run time
Type check / Type check (3.10)	29s
Lint check / Lint check (3.11)	11s
Type check / Type check (3.13)	24s
Docs check / Docs check	1m 5s
Lint check / Lint check (3.10)	14s
Lint check / Lint check (3.13)	11s
Unit tests / Unit tests (windows-latest, 3.10)	1m 1s
Unit tests / Unit tests (windows-latest, 3.13)	1m 3s
Type check / Type check (3.11)	19s
Unit tests / Unit tests (windows-latest, 3.11)	1m 4s
Lint check / Lint check (3.12)	14s
Unit tests / Unit tests (ubuntu-latest, 3.10)	28s
Unit tests / Unit tests (ubuntu-latest, 3.12)	26s
Unit tests / Unit tests (windows-latest, 3.12)	54s
Unit tests / Unit tests (ubuntu-latest, 3.11)	26s
Type check / Type check (3.12)	21s
Integration tests / Integration tests (3.13)	9m 55s
Unit tests / Unit tests (ubuntu-latest, 3.13)	24s
Integration tests / Integration tests (3.10)	9m 53s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	29m 2s

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