refactor!: Make `Actor` initialization stricter and more predictable #731

Job	Run time
Docs check / Docs check	1m 2s
Type check / Type check (3.11)	23s
Type check / Type check (3.12)	26s
Type check / Type check (3.10)	20s
Unit tests / Unit tests (windows-latest, 3.10)	55s
Unit tests / Unit tests (windows-latest, 3.12)	1m 6s
Unit tests / Unit tests (ubuntu-latest, 3.11)	23s
Unit tests / Unit tests (ubuntu-latest, 3.13)	22s
Lint check / Lint check (3.11)	11s
Unit tests / Unit tests (ubuntu-latest, 3.10)	26s
Unit tests / Unit tests (windows-latest, 3.11)	1m 50s
Lint check / Lint check (3.10)	13s
Lint check / Lint check (3.13)	17s
Unit tests / Unit tests (ubuntu-latest, 3.12)	26s
Integration tests / Integration tests (3.13)	10m 3s
Lint check / Lint check (3.12)	13s
Unit tests / Unit tests (windows-latest, 3.13)	57s
Integration tests / Integration tests (3.10)	10m 24s
Type check / Type check (3.13)	20s
Integration tests / Approve integration tests for PRs from forks	-1s
Integration tests / Integration tests for PRs from forks	0s
	30m 16s

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