refactor!: Make `Actor` initialization stricter and more predictable #723

Job	Run time
Docs check / Docs check	1m 11s
Lint check / Lint check (3.11)	12s
Lint check / Lint check (3.13)	14s
Lint check / Lint check (3.12)	10s
Unit tests / Unit tests (ubuntu-latest, 3.10)	25s
Unit tests / Unit tests (ubuntu-latest, 3.12)	26s
Unit tests / Unit tests (ubuntu-latest, 3.11)	24s
Unit tests / Unit tests (windows-latest, 3.11)	1m 8s
Type check / Type check (3.11)	24s
Lint check / Lint check (3.10)	11s
Unit tests / Unit tests (windows-latest, 3.10)	51s
Unit tests / Unit tests (windows-latest, 3.12)	1m 11s
Unit tests / Unit tests (ubuntu-latest, 3.13)	25s
Type check / Type check (3.10)	23s
Type check / Type check (3.13)	19s
Type check / Type check (3.12)	22s
Unit tests / Unit tests (windows-latest, 3.13)	1m 7s
Integration tests / Approve integration tests for PRs from forks	7m 10s
Integration tests / Integration tests (3.10)	10m 55s
Integration tests / Integration tests (3.13)	11m 36s
Integration tests / Integration tests for PRs from forks	0s
	39m 4s

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