refactor!: Make `Actor` initialization stricter and more predictable #718

Job	Run time
Type check / Type check (3.10)	23s
Type check / Type check (3.12)	22s
Docs check / Docs check	1m 10s
Lint check / Lint check (3.10)	12s
Lint check / Lint check (3.12)	13s
Type check / Type check (3.11)	25s
Lint check / Lint check (3.11)	11s
Lint check / Lint check (3.13)	12s
Unit tests / Unit tests (ubuntu-latest, 3.11)	26s
Type check / Type check (3.13)	30s
Unit tests / Unit tests (ubuntu-latest, 3.12)	29s
Unit tests / Unit tests (ubuntu-latest, 3.10)	26s
Unit tests / Unit tests (windows-latest, 3.13)	56s
Unit tests / Unit tests (windows-latest, 3.11)	59s
Unit tests / Unit tests (windows-latest, 3.12)	1m 7s
Unit tests / Unit tests (windows-latest, 3.10)	2m 31s
Unit tests / Unit tests (ubuntu-latest, 3.13)	29s
Integration tests / Integration tests (3.13)	11m 1s
Integration tests / Integration tests (3.10)	10m 57s
Integration tests / Approve integration tests for PRs from forks	0s
Integration tests / Integration tests for PRs from forks	0s
	32m 59s

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