Create the dependency-only Runtime project before moving any gameplay owner, enforce its direct, transitive, source, and load-time closure, and pin coherent lifetime-group extraction plus retryable teardown ordering. No production behavior changes in J0.
Validated by the four focused Runtime boundary tests, a zero-error Release solution build, and 8,406 passing Release tests with five pre-existing skips.
Co-authored-by: Codex <codex@openai.com>
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