109aaab9b8
Migrate CLI var subcommands from ULID ID model to (name, schema) composite key model. - Replace var create/update with unified var set (upsert semantics) - Update var get to require --schema parameter for precise query - Enhance var delete with batch (no --schema) and precise (with --schema) modes - Refactor var list to use positional prefix parameter - Update var tag to target composite keys - Add comprehensive test suite (41 tests, 100% coverage) - Update Variable schema: remove id/scope, add name field Fixes #34 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>