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fix(cdp): preserve upstream timing defaults for missing fields

Merge the timing initializer over the defaults pre-seeded in newRequest
instead of overwriting every field with 0.0, mirroring upstream's
Object.assign(request._timing, initializer.timing). This keeps the
correct -1 defaults for fields the server omits and also guards the
top-level timing object, which some CDP implementations omit entirely.

Add unit tests for the timing merge helper and an integration test for
response timing.