15269f97109668cee0fe3e56fee1598dbfb0a455  Clamp depths below 1px in CSSPerspective::toMatrix()

Classified as not security-relevant.
This commit was flagged by the signal scorer and reviewed by AI (not a human). It is listed only so the triage is auditable; there is no root-cause analysis because this is not a vulnerability fix.

Structural signals: clamp_saturate (+1.8), msg_soft (+1.0), area:third_party/blink/renderer/core/ (+2.5), surgical (+1.3)