v1.1.0

• Add support for az format with auto-detection.
• Add NewAz constructor that auto-detects lz4 or zstd format from stream header. Consolidates compression support under the go-again/az package, replacing separate klauspost/compress and pierrec/lz4 dependencies.
• Update NewZstd and NewLz4 to use az internally. Update documentation, examples, and compression comparison table.

v1.0.0

• Add tarfs package implementing a read-only, in-memory fs.FS backed by
  tar archives.
• Core implementation (tarfs.go):
  • FS type storing entries and synthesized directory structure.
  • Supports fs.FS, fs.ReadDirFS and fs.ReadFileFS.
  • File handles implement fs.File, fs.ReadDirFile and io.Seeker
    (enables HTTP range requests).
  • Normalizes paths (strips "./"), synthesizes missing directory
    headers, returns sorted directory listings.
  • Constructors: New (raw tar), NewFromReader (streaming tar).
• Compression helpers:
  • NewGzip (gzip)
  • NewZstd (zstd via github.com/klauspost/compress)
  • NewLz4 (lz4 via github.com/pierrec/lz4/v4)
  • NewBzip2 (bzip2 using stdlib decode)
• Add comprehensive tests (tarfs_test.go) exercising plain tar, gzip,
  zstd, lz4, bzip2, path normalization, synthetic dirs, fs.Sub and
  net/http.FileServer integration (including range requests).
• Documentation: README.md with usage examples (embed via //go:embed,
  serving with http.FileServer), compression comparisons, SPA fallback
  example, dev-mode placeholder and API reference.
• Module files: go.mod and go.sum with required dependencies.
• License: MIT.