v0.3.0

Added

• Add passthrough viewing and diffing for plain text and Jinja templates. Known
  extensions such as .txt, .log, .j2, .jinja, and .jinja2 are used as
  type-profile hints rather than the only detection mechanism.
• Add --type plain and --type jinja for explicit passthrough handling.
  Redirected stdout preserves input bytes instead of formatting these types.

Changed

• Speed up lazy JSONL viewing for large records by reducing spool indexing and
  long-line readback overhead, with separate benchmarks for transform/spool cost
  and first-window readback.
• Speed up eager whole-document viewing for large JSON/XML-compatible files by
  using faster temp-file line indexing and larger transform IO buffers.
• Clarify internal load strategy boundaries and split the Rust load/format
  benchmark harness into runner, case, and fixture modules.