ldgr-core v0.1.10

Corrected Core schema-v2 release. LDGR Core remains the sole central-database authority at schema v2. Recognized released v1 databases migrate directly to v2; released v2 databases receive the current v2 contract in place; databases touched by the withdrawn schema-v4 build normalize transactionally back to v2. Use ldgr schema doctor for a read-only preview and ldgr migrate, ldgr status, or ldgr context to perform the backed-up migration. Native binaries: Linux x86_64, Linux ARM64, and Windows x86_64.