Make enum and required-flag validation alias-aware via a shared
flagNameProvided/EffectiveValue path so values passed through flag
aliases are no longer skipped; drop the fully-migrated runtime risk/gate
annotation bridge and the orphaned tool-metadata/title annotation
writers, trimming the cli seam re-exports accordingly.
Break the remaining corecmd→cli reverse dependency by owning
runtimeannotate and contractfinal on the framework side, with cli
keeping thin re-exports. Document the three authoring tiers and that
Shortcut may use DeclareLeafMetadata.
Co-authored-by: Cursor <cursoragent@cursor.com>