refactor!: Make `Actor` initialization stricter and more predictable #671

Job	Run time
Lint check / Lint check (3.11)	14s
Lint check / Lint check (3.12)	14s
Lint check / Lint check (3.13)	10s
Lint check / Lint check (3.10)	16s
Type check / Type check (3.10)	27s
Type check / Type check (3.13)	30s
Type check / Type check (3.11)	26s
Type check / Type check (3.12)	30s
Docs check / Docs check	1m 1s
Unit tests / Unit tests (ubuntu-latest, 3.10)	24s
Unit tests / Unit tests (ubuntu-latest, 3.13)	24s
Unit tests / Unit tests (ubuntu-latest, 3.11)	25s
Unit tests / Unit tests (windows-latest, 3.11)	1m 34s
Unit tests / Unit tests (ubuntu-latest, 3.12)	27s
Unit tests / Unit tests (windows-latest, 3.12)	1m 1s
Unit tests / Unit tests (windows-latest, 3.10)	1m 2s
Unit tests / Unit tests (windows-latest, 3.13)	56s
Integration tests / Integration tests (3.13)	3m 16s
Integration tests / Integration tests (3.10)	3m 13s
Integration tests / Approve integration tests for PRs from forks	-1s
Integration tests / Integration tests for PRs from forks	0s
	16m 29s

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