Init dididecks-ai — repo scaffold, context-v migration, splash, client-sites re-parented
Promoted DidiDecks from `ai-labs/context-v/specs/` folder to a first-class child of the ai-labs pseudomonorepo — its own GitHub repo, its own three-tier branches, its own context-v/ + changelog/, its own splash, and the two driving client engagements re-parented from astro-knots.