refactor!: Make `Actor` initialization stricter and more predictable #670

Job	Run time
Lint check / Lint check (3.10)	10s
Lint check / Lint check (3.12)	10s
Lint check / Lint check (3.11)	13s
Type check / Type check (3.13)	30s
Type check / Type check (3.10)	24s
Docs check / Docs check	1m 3s
Lint check / Lint check (3.13)	8s
Type check / Type check (3.11)	25s
Type check / Type check (3.12)	23s
Unit tests / Unit tests (ubuntu-latest, 3.12)	23s
Unit tests / Unit tests (ubuntu-latest, 3.10)	26s
Unit tests / Unit tests (ubuntu-latest, 3.13)	25s
Unit tests / Unit tests (windows-latest, 3.13)	1m 4s
Unit tests / Unit tests (windows-latest, 3.10)	53s
Unit tests / Unit tests (ubuntu-latest, 3.11)	23s
Unit tests / Unit tests (windows-latest, 3.12)	55s
Unit tests / Unit tests (windows-latest, 3.11)	56s
Integration tests / Integration tests (3.13)	3m 25s
Integration tests / Integration tests (3.10)	3m 19s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	15m 35s

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