refactor!: Make `Actor` initialization stricter and more predictable #673

Job	Run time
Unit tests / Unit tests (ubuntu-latest, 3.11)	21s
Lint check / Lint check (3.13)	12s
Type check / Type check (3.11)	27s
Lint check / Lint check (3.10)	15s
Unit tests / Unit tests (windows-latest, 3.11)	1m 1s
Unit tests / Unit tests (windows-latest, 3.12)	59s
Unit tests / Unit tests (ubuntu-latest, 3.13)	27s
Unit tests / Unit tests (windows-latest, 3.13)	54s
Lint check / Lint check (3.11)	14s
Unit tests / Unit tests (ubuntu-latest, 3.12)	28s
Unit tests / Unit tests (ubuntu-latest, 3.10)	31s
Lint check / Lint check (3.12)	15s
Docs check / Docs check	1m 6s
Type check / Type check (3.10)	25s
Unit tests / Unit tests (windows-latest, 3.10)	53s
Type check / Type check (3.13)	30s
Integration tests / Integration tests (3.10)	10m 6s
Type check / Type check (3.12)	32s
Integration tests / Integration tests (3.13)	10m 55s
Integration tests / Approve integration tests for PRs from forks	11m 37s
Integration tests / Integration tests for PRs from forks	0s
	42m 8s

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