fix: atomically refresh resource lock heartbeats

[V3RON]

Summary

• atomically replace owner.json during resource lock heartbeat refreshes so readers never observe truncated JSON
• skip overlapping heartbeat ticks in the same process to avoid self-races while a prior refresh is still in flight
• add a regression test that delays heartbeat writes and verifies owner metadata remains readable across repeated refreshes

Testing

• pnpm vitest run packages/jest/src/__tests__/resource-lock.test.ts
• pnpm vitest run --project @react-native-harness/jest

[vercel]

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Project	Deployment	Actions	Updated (UTC)
react-native-harness	Ready	Preview, Comment	Apr 7, 2026 10:29am