refactor(engine): add fingerprinted browser leases#2159
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This was referenced Jul 10, 2026
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This was referenced Jul 10, 2026
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What
Replace partial browser pooling with immutable, fingerprinted browser leases.
Why
Acquisition could observe the wrong launch configuration or race a browser that was already closing, and construction failure could leak ownership.
How
Model launching/ready/closing entries, remove closing instances from availability, return idempotent leases, and roll back partial sessions.
Test plan