v0.6.0

Added

• ProcessToWriter API (457d341): New method that writes preprocessed output directly to an io.Writer, avoiding the output buffer allocation for large datasets
• Sentinel Errors (0cd1558):
  • ErrNilWriter: Returned when a nil io.Writer is passed to ProcessToWriter
  • ErrNilReader: Returned when a nil io.Reader is passed to Process or ProcessToWriter, distinguished from ErrEmptyFile
• Struct Tag Parse Cache (457d341): sync.Map-based cache keyed by (reflect.Type, strict) eliminates redundant tag parsing on repeated Process calls

Fixed

• Slice Reset on Reuse (457d341): Process now calls SetLen(0) before appending, so reusing the same destination slice no longer carries over stale elements
• Sentinel Error Wrapping (457d341, 3026a38): Errors from fileparser.Parse are now wrapped with ErrEmptyFile / ErrUnsupportedFileType so errors.Is works correctly
• Cross-Field Validation (457d341): Cross-field validators now use a preprocessed field-value map instead of column indices, fixing target field ... not found when the column is absent but filled by prep:"default=..."
• wrapParseError Precision (3026a38, 0cd1558): Replaced broad substring matching with exact message matching against fileparser v0.5.1 error strings; separated "reader cannot be nil" from ErrEmptyFile into its own ErrNilReader

Changed

• CI Hardening (457d341, 3026a38): Added -race flag and govulncheck (pinned v1.1.4) to CI workflow
• Go Version (785493a, 3026a38): Bumped minimum Go version to 1.25; updated golang.org/x/net to v0.51.0 to resolve GO-2026-4559
• Documentation (c685c44):
  • Rewrote "Before Using fileprep" as concise "Gotchas" section across all 7 README languages
  • Added ProcessToWriter to README, doc.go, and example_test.go
  • Fixed CONTRIBUTING.md reference to non-existent .cursorrules / .github/copilot-instructions.md
  • Added version support table to SECURITY.md