feat(specs): patch egress

[ninan-nn]

Summary

• Update specs/sandbox-lifecycle.yml to add egress management endpoints:
  • PATCH /sandboxes/{sandboxId}/egress
  • GET /sandboxes/{sandboxId}/egress
• Define PATCH request body as NetworkRule[] and GET response as NetworkPolicy.
• Clarify PATCH behavior as overwrite semantics (not append/merge):
  • for duplicate target values, the later rule overrides the earlier one (last rule wins).
• Add request example for duplicate target to make overwrite behavior explicit.

Testing

• Not run (spec-only change)
• Unit tests
• Integration tests
• e2e / manual verification

Breaking Changes

• None
• Yes (describe impact and migration path)

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[Pangjiping]

LGTM

[hittyt]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

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[hittyt]

LGTM