refactor!: Make `Actor` initialization stricter and more predictable #732

Job	Run time
Unit tests / Unit tests (ubuntu-latest, 3.12)	27s
Unit tests / Unit tests (ubuntu-latest, 3.11)	25s
Unit tests / Unit tests (ubuntu-latest, 3.10)	28s
Unit tests / Unit tests (ubuntu-latest, 3.13)	23s
Unit tests / Unit tests (windows-latest, 3.12)	49s
Docs check / Docs check	1m 5s
Unit tests / Unit tests (windows-latest, 3.10)	44s
Unit tests / Unit tests (windows-latest, 3.11)	1m 7s
Unit tests / Unit tests (windows-latest, 3.13)	48s
Type check / Type check (3.12)	20s
Type check / Type check (3.10)	21s
Lint check / Lint check (3.11)	11s
Type check / Type check (3.13)	25s
Type check / Type check (3.11)	19s
Lint check / Lint check (3.10)	10s
Lint check / Lint check (3.12)	10s
Integration tests / Integration tests (3.13)	10m 29s
Integration tests / Integration tests (3.10)	9m 55s
Integration tests / Approve integration tests for PRs from forks	46s
Lint check / Lint check (3.13)	11s
Integration tests / Integration tests for PRs from forks	0s
	29m 33s

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