refactor!: Make `Actor` initialization stricter and more predictable #684

Job	Run time
Lint check / Lint check (3.12)	9s
Lint check / Lint check (3.13)	15s
Lint check / Lint check (3.10)	13s
Lint check / Lint check (3.11)	8s
Type check / Type check (3.11)	28s
Docs check / Docs check	1m 5s
Type check / Type check (3.12)	24s
Type check / Type check (3.13)	24s
Type check / Type check (3.10)	27s
Unit tests / Unit tests (ubuntu-latest, 3.11)	30s
Unit tests / Unit tests (windows-latest, 3.13)	49s
Unit tests / Unit tests (windows-latest, 3.12)	59s
Unit tests / Unit tests (windows-latest, 3.10)	47s
Unit tests / Unit tests (ubuntu-latest, 3.13)	23s
Unit tests / Unit tests (ubuntu-latest, 3.12)	25s
Unit tests / Unit tests (ubuntu-latest, 3.10)	28s
Unit tests / Unit tests (windows-latest, 3.11)	49s
Integration tests / Integration tests (3.13)	10m 40s
Integration tests / Integration tests (3.10)	9m 47s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	29m 10s

Provide feedback