feat: transparent gzip input (.gz files and stdin) - #223
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Add transparent gzip decompression for .gz files and gzip-magic stdin using std.compress.flate.Decompress (gzip container). No new dependencies. - Files: .gz extension detection, auto-format from inner extension (data.csv.gz → csv, table ) - Stdin: peek(2) magic sniff (0x1f 0x8b), non-consuming - Streaming decompress into existing buffered reader - Table name derived from inner name (strip .gz before stem) - Clear error on corrupt gzip stream (fatal + csv_error) - Non-gzip path unchanged (no sniffing overhead beyond 2 bytes) Closes #220
- args.zig: path literally ".gz" produced an empty table name; fall back to the full path stem when stripping the extension collapses it. - main.zig: wrap the flate reader so error.ReadFailed is translated into a message naming the specific gzip failure (EndOfStream, WrongGzipChecksum, etc.) instead of a generic "failed to parse CSV". The wrapper forwards to flate's vtable methods and mirrors its buffer cursor so the shared-buffer reader keeps working; the previous blind forward hung on empty fill slices. - build.zig: corrupt-gzip integration test now uses a real .gz name (the old fixture ended .gz_truncated and never hit the gzip path) and asserts the new error message.
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Implements transparent gzip decompression for .gz files and gzip-magic stdin (Issue #220) using std.compress.flate.Decompress. Zero new dependencies.
Closes #220