refactor!: Make `Actor` initialization stricter and more predictable #713

Job	Run time
Lint check / Lint check (3.12)	14s
Lint check / Lint check (3.13)	14s
Lint check / Lint check (3.10)	10s
Docs check / Docs check	1m 7s
Type check / Type check (3.11)	22s
Lint check / Lint check (3.11)	10s
Type check / Type check (3.12)	24s
Type check / Type check (3.10)	23s
Type check / Type check (3.13)	22s
Unit tests / Unit tests (windows-latest, 3.10)	52s
Unit tests / Unit tests (ubuntu-latest, 3.12)	31s
Unit tests / Unit tests (ubuntu-latest, 3.10)	30s
Unit tests / Unit tests (ubuntu-latest, 3.13)	28s
Unit tests / Unit tests (windows-latest, 3.12)	52s
Unit tests / Unit tests (windows-latest, 3.13)	50s
Unit tests / Unit tests (ubuntu-latest, 3.11)	27s
Unit tests / Unit tests (windows-latest, 3.11)	50s
Integration tests / Integration tests (3.10)	14m 8s
Integration tests / Integration tests (3.13)	14m 13s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	37m 7s

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