refactor!: Make `Actor` initialization stricter and more predictable #711

Job	Run time
Docs check / Docs check	1m 2s
Unit tests / Unit tests (ubuntu-latest, 3.10)	24s
Unit tests / Unit tests (windows-latest, 3.11)	54s
Unit tests / Unit tests (ubuntu-latest, 3.11)	25s
Unit tests / Unit tests (windows-latest, 3.12)	1m 4s
Unit tests / Unit tests (ubuntu-latest, 3.13)	24s
Unit tests / Unit tests (ubuntu-latest, 3.12)	30s
Unit tests / Unit tests (windows-latest, 3.10)	1m 3s
Type check / Type check (3.11)	20s
Unit tests / Unit tests (windows-latest, 3.13)	56s
Type check / Type check (3.10)	22s
Type check / Type check (3.12)	24s
Type check / Type check (3.13)	24s
Lint check / Lint check (3.10)	11s
Lint check / Lint check (3.12)	11s
Lint check / Lint check (3.13)	13s
Lint check / Lint check (3.11)	15s
Integration tests / Integration tests (3.10)	10m 24s
Integration tests / Integration tests (3.13)	10m 42s
Integration tests / Approve integration tests for PRs from forks	15s
Integration tests / Integration tests for PRs from forks	0s
	30m 23s

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