Forgeflow v4.3.70

Forgeflow 4.3.70 wires lean guidance into the normal review and ship path. /review now attempts the lean review helper automatically when available, and /ship plus ship-prepare record lean-readiness evidence for lean-path work while preserving the existing review, secret-scan, validation, PR, push, and CI gates.

Validation: release-version, doc-links, command coverage, release notes draft, install manifest, update-forgeflow, runtime helper contract, health check, and source smoke all passed.