refactor!: Make `Actor` initialization stricter and more predictable #678

Job	Run time
Docs check / Docs check	59s
Type check / Type check (3.10)	22s
Type check / Type check (3.13)	28s
Lint check / Lint check (3.13)	17s
Lint check / Lint check (3.12)	9s
Type check / Type check (3.11)	28s
Type check / Type check (3.12)	29s
Unit tests / Unit tests (windows-latest, 3.12)	50s
Unit tests / Unit tests (ubuntu-latest, 3.12)	25s
Unit tests / Unit tests (windows-latest, 3.11)	1m 1s
Lint check / Lint check (3.11)	10s
Unit tests / Unit tests (windows-latest, 3.10)	50s
Lint check / Lint check (3.10)	14s
Unit tests / Unit tests (ubuntu-latest, 3.11)	24s
Unit tests / Unit tests (ubuntu-latest, 3.13)	22s
Unit tests / Unit tests (ubuntu-latest, 3.10)	30s
Integration tests / Integration tests (3.13)	10m 24s
Unit tests / Unit tests (windows-latest, 3.13)	56s
Integration tests / Integration tests (3.10)	9m 54s
Integration tests / Approve integration tests for PRs from forks	-1s
Integration tests / Integration tests for PRs from forks	-1s
	29m 10s

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