track(merged): feat(proxy-init): add enforce-drop mode for proxy-sidecar egress enforcement (ext#484)

Tracking stub for **merged PR kagenti-extensions#484** — auto-created so it rolls up as completed work under epic #1429.

https://github.com/kagenti/kagenti-extensions/pull/484

_Closed because the PR is already merged. Label `epic-progress` marks auto-created trackers._