refactor!: Make `Actor` initialization stricter and more predictable #708

Job	Run time
Docs check / Docs check	1m 7s
Lint check / Lint check (3.10)	13s
Lint check / Lint check (3.13)	14s
Type check / Type check (3.12)	24s
Lint check / Lint check (3.12)	14s
Lint check / Lint check (3.11)	10s
Type check / Type check (3.11)	20s
Type check / Type check (3.10)	22s
Type check / Type check (3.13)	26s
Unit tests / Unit tests (ubuntu-latest, 3.10)	27s
Unit tests / Unit tests (windows-latest, 3.12)	49s
Unit tests / Unit tests (windows-latest, 3.10)	57s
Unit tests / Unit tests (ubuntu-latest, 3.13)	28s
Unit tests / Unit tests (ubuntu-latest, 3.12)	27s
Unit tests / Unit tests (ubuntu-latest, 3.11)	27s
Unit tests / Unit tests (windows-latest, 3.13)	58s
Unit tests / Unit tests (windows-latest, 3.11)	57s
Integration tests / Integration tests (3.13)	3m 27s
Integration tests / Integration tests (3.10)	3m 25s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	15m 52s

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