docs: add WAIT status for pending CI

[dapi]

Summary

• add the non-terminal WAIT run status for external events that need no human action
• preserve pending CI evidence and polling behavior without routing simple waits to HUMAN_GATE
• permit STATUS: WAIT in the output contract

Validation

• ruby tools/validate-priming-manifests.rb template/memory-bank
• memory-bank-cli lint --scope-root template/memory-bank --entrypoint template/memory-bank/README.md
• memory-bank-cli doctor --profile template
• git diff --check

The optional codex review --uncommitted could not initialize its in-process app-server in this sandbox.