heliosdb-nano-branches

Database branching in HeliosDB-Nano — ephemeral fork-test-discard sandboxes. Create a branch from main (or any other branch, anchored with a required AS OF clause), make isolated changes, validate, then discard. The primary pattern for agent sandboxes, migration rehearsals, A/B experiments, and short-lived "what if" workspaces. MERGE BRANCH does move rows, but it is last-writer-wins with no conflict detection —…