Magpie Security Issue Import Via Forwarder

apache/magpie-security-issue-import-via-forwarder

| Optional sub-skill of `security-issue-import`, `security-issue-invalidate`, and `security-issue-sync` that arrive directly from the reporter but was relayed onto `<security-list>` by an upstream broker (the ASF security team, a third-party disclosure platform, or an internal SOC). Runs after the parent skill's generic classification cascade, dispatches through adapters declared in `forwarders.enabled` per `tools/forwarder-relay/README.md`, applies the matched adapter's preamble-detect + credit-extract + reporter- addressing rules, and hands the routing decision back. Never mutates tracker state on its own.