refactor!: Make `Actor` initialization stricter and more predictable #685

Job	Run time
Lint check / Lint check (3.12)	11s
Type check / Type check (3.11)	26s
Lint check / Lint check (3.11)	13s
Lint check / Lint check (3.13)	9s
Lint check / Lint check (3.10)	10s
Type check / Type check (3.10)	24s
Type check / Type check (3.12)	30s
Type check / Type check (3.13)	29s
Unit tests / Unit tests (ubuntu-latest, 3.11)	26s
Unit tests / Unit tests (ubuntu-latest, 3.13)	22s
Docs check / Docs check	1m 6s
Unit tests / Unit tests (windows-latest, 3.10)	40s
Unit tests / Unit tests (ubuntu-latest, 3.10)	25s
Unit tests / Unit tests (windows-latest, 3.11)	44s
Unit tests / Unit tests (ubuntu-latest, 3.12)	28s
Unit tests / Unit tests (windows-latest, 3.12)	51s
Unit tests / Unit tests (windows-latest, 3.13)	50s
Integration tests / Integration tests (3.10)	10m 35s
Integration tests / Integration tests (3.13)	10m 27s
Integration tests / Approve integration tests for PRs from forks	18m 2s
Integration tests / Integration tests for PRs from forks	0s
	47m 28s

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