refactor!: Make `Actor` initialization stricter and more predictable #722

Job	Run time
Type check / Type check (3.10)	25s
Type check / Type check (3.12)	24s
Docs check / Docs check	1m 5s
Type check / Type check (3.11)	24s
Lint check / Lint check (3.12)	13s
Lint check / Lint check (3.11)	9s
Type check / Type check (3.13)	21s
Unit tests / Unit tests (ubuntu-latest, 3.10)	29s
Lint check / Lint check (3.13)	9s
Unit tests / Unit tests (ubuntu-latest, 3.11)	22s
Unit tests / Unit tests (windows-latest, 3.10)	54s
Unit tests / Unit tests (ubuntu-latest, 3.13)	30s
Unit tests / Unit tests (windows-latest, 3.13)	1m 1s
Unit tests / Unit tests (windows-latest, 3.11)	1m 2s
Unit tests / Unit tests (windows-latest, 3.12)	48s
Lint check / Lint check (3.10)	9s
Unit tests / Unit tests (ubuntu-latest, 3.12)	30s
Integration tests / Integration tests (3.13)	10m 59s
Integration tests / Integration tests (3.10)	11m 14s
Integration tests / Approve integration tests for PRs from forks	-1s
Integration tests / Integration tests for PRs from forks	0s
	31m 7s

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