refactor!: Make `Actor` initialization stricter and more predictable #689

Job	Run time
Lint check / Lint check (3.10)	13s
Type check / Type check (3.10)	28s
Lint check / Lint check (3.13)	11s
Type check / Type check (3.11)	28s
Lint check / Lint check (3.11)	9s
Type check / Type check (3.12)	28s
Docs check / Docs check	1m 0s
Type check / Type check (3.13)	26s
Lint check / Lint check (3.12)	9s
Unit tests / Unit tests (ubuntu-latest, 3.10)	28s
Unit tests / Unit tests (ubuntu-latest, 3.12)	32s
Unit tests / Unit tests (ubuntu-latest, 3.13)	27s
Unit tests / Unit tests (windows-latest, 3.11)	47s
Unit tests / Unit tests (windows-latest, 3.10)	52s
Unit tests / Unit tests (ubuntu-latest, 3.11)	30s
Unit tests / Unit tests (windows-latest, 3.13)	59s
Unit tests / Unit tests (windows-latest, 3.12)	1m 1s
Integration tests / Integration tests (3.10)	10m 15s
Integration tests / Integration tests (3.13)	10m 31s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	29m 54s

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