refactor!: Make `Actor` initialization stricter and more predictable #668

Job	Run time
Docs check / Docs check	1m 11s
Lint check / Lint check (3.12)	11s
Lint check / Lint check (3.10)	10s
Type check / Type check (3.11)	24s
Type check / Type check (3.10)	28s
Lint check / Lint check (3.11)	11s
Type check / Type check (3.12)	29s
Type check / Type check (3.13)	26s
Unit tests / Unit tests (windows-latest, 3.13)	53s
Unit tests / Unit tests (ubuntu-latest, 3.12)	31s
Unit tests / Unit tests (windows-latest, 3.10)	54s
Unit tests / Unit tests (ubuntu-latest, 3.10)	27s
Unit tests / Unit tests (ubuntu-latest, 3.11)	29s
Lint check / Lint check (3.13)	14s
Unit tests / Unit tests (windows-latest, 3.12)	1m 4s
Unit tests / Unit tests (ubuntu-latest, 3.13)	26s
Unit tests / Unit tests (windows-latest, 3.11)	50s
Integration tests / Integration tests (3.10)	3m 14s
Integration tests / Integration tests (3.13)	3m 17s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	15m 49s

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