fix(startup): scope trace to accelerated CEF

[bnema]

Summary

• scope the first-presentation trace API and documentation to the CEF/DMABUF/GTK path
• remove silently rejected WebKit and generic UI milestones
• verify every CEF bridge callback has ordered, one-shot trace effects

Validation

• /usr/bin/go test -race ./internal/infrastructure/cef ./internal/logging
• /usr/bin/go fmt ./...
• make lint
• make test
• make staticcheck
• go vet ./...
• make build
• make check

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