refactor!: Make `Actor` initialization stricter and more predictable #726

Job	Run time
Docs check / Docs check	1m 8s
Unit tests / Unit tests (ubuntu-latest, 3.13)	25s
Type check / Type check (3.11)	22s
Type check / Type check (3.13)	23s
Unit tests / Unit tests (ubuntu-latest, 3.12)	25s
Unit tests / Unit tests (ubuntu-latest, 3.10)	23s
Type check / Type check (3.12)	22s
Unit tests / Unit tests (ubuntu-latest, 3.11)	24s
Type check / Type check (3.10)	22s
Unit tests / Unit tests (windows-latest, 3.10)	56s
Lint check / Lint check (3.11)	10s
Unit tests / Unit tests (windows-latest, 3.13)	1m 9s
Lint check / Lint check (3.10)	9s
Lint check / Lint check (3.12)	10s
Integration tests / Integration tests (3.13)	10m 59s
Lint check / Lint check (3.13)	12s
Unit tests / Unit tests (windows-latest, 3.11)	1m 4s
Unit tests / Unit tests (windows-latest, 3.12)	52s
Integration tests / Integration tests (3.10)	10m 32s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	-1s
	30m 26s

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