ldgr-core v0.1.11

Fixes automatic Core schema-v1 migration for real-world ledgers.

ldgr status, ldgr context, and ldgr init now create a verified backup and migrate recognized v1 databases to authoritative schema v2. Adapter-owned tables and data are preserved, and missing optional Core tables are created safely during migration.

Native binaries: Linux x86_64, Linux ARM64, and Windows x86_64. All three were built natively and passed backed-up v1-to-v2 migration smoke tests before publication.