v0.5.2

Added

• Added QuackDB.Storage observability helpers for DuckDB table storage segments, compression summaries, database size, and checkpointing.
• Added QuackDB.Meta catalog helpers for listing tables, attached databases, and logical table columns.
• Added QuackDB.Server recovery_mode: :no_wal_writes support for rebuildable local DuckDB databases.
• Added append telemetry phase metrics for encode, transport, decode, request/response bytes, append duration, and rows/sec.

Changed

• Optimized row-oriented native append encoding for wide ordered keyword rows by transposing rows to columns in one pass.
• Switched unsigned LEB128 protocol encoding to varint.
• Optimized native append vector encoding by reducing redundant count and validity passes.
• Optimized Ecto append inserts by using column-oriented append for direct inserts and an ordered-row fast path for temporary append staging.
• Added ExDNA zero-duplication and Reach smell checks to mix ci.