refactor!: Make `Actor` initialization stricter and more predictable #707

Job	Run time
Type check / Type check (3.10)	21s
Type check / Type check (3.13)	26s
Type check / Type check (3.11)	24s
Type check / Type check (3.12)	23s
Lint check / Lint check (3.10)	14s
Lint check / Lint check (3.12)	15s
Lint check / Lint check (3.11)	10s
Docs check / Docs check	56s
Lint check / Lint check (3.13)	10s
Unit tests / Unit tests (ubuntu-latest, 3.11)	26s
Unit tests / Unit tests (windows-latest, 3.10)	55s
Unit tests / Unit tests (windows-latest, 3.11)	52s
Unit tests / Unit tests (ubuntu-latest, 3.10)	28s
Unit tests / Unit tests (windows-latest, 3.13)	1m 2s
Unit tests / Unit tests (windows-latest, 3.12)	56s
Integration tests / Integration tests (3.10)	3m 27s
Unit tests / Unit tests (ubuntu-latest, 3.12)	26s
Unit tests / Unit tests (ubuntu-latest, 3.13)	24s
Integration tests / Integration tests (3.13)	3m 31s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	15m 46s

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