refactor!: Make `Actor` initialization stricter and more predictable #727

Job	Run time
Lint check / Lint check (3.10)	10s
Lint check / Lint check (3.13)	12s
Lint check / Lint check (3.12)	9s
Type check / Type check (3.13)	21s
Lint check / Lint check (3.11)	10s
Docs check / Docs check	59s
Type check / Type check (3.12)	20s
Integration tests / Integration tests (3.13)	10m 24s
Type check / Type check (3.11)	18s
Unit tests / Unit tests (ubuntu-latest, 3.12)	24s
Unit tests / Unit tests (ubuntu-latest, 3.11)	25s
Type check / Type check (3.10)	24s
Integration tests / Approve integration tests for PRs from forks	9m 15s
Unit tests / Unit tests (ubuntu-latest, 3.13)	22s
Integration tests / Integration tests (3.10)	9m 53s
Unit tests / Unit tests (windows-latest, 3.11)	1m 19s
Unit tests / Unit tests (windows-latest, 3.10)	1m 6s
Unit tests / Unit tests (ubuntu-latest, 3.10)	23s
Unit tests / Unit tests (windows-latest, 3.13)	1m 55s
Unit tests / Unit tests (windows-latest, 3.12)	59s
Integration tests / Integration tests for PRs from forks	-1s
	39m 27s

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