v0.2.0

Added

• WriteBuf::finish() and related functions now return validated
  &strs instead of &[u8]s you have to validate yourself. This makes
  this library useful for the simple case of writing to a
  fixed-size/preallocated buffer.
• WriteBuf::capacity() returning the size of the target buffer.
• WriteBuf::remaining() returning the number of bytes still available
  for write_str operations (truncation-aware; saturates on
  reserve > capacity - position).
• WriteBuf::clear() resetting position and the truncated flag for
  buffer reuse. The configured reserve is preserved.
• Truncated<'_> error type, returned by the WriteBuf::finish*
  family. Carries the portion of the output that was successfully
  written so callers don't have to track it separately.
• Truncated::written() and Truncated::written_len() -- inherent
  accessors that mirror the methods on TruncatedResultExt so the
  same vocabulary works whether you hold the Truncated directly or a
  Result<&str, Truncated<'_>>.
• WriteBuf::written() returns the written portion as a &str
  (companion to the existing written_bytes() accessor).
• fmt::Debug impl on WriteBuf for diagnostic logging. Shows
  position, capacity, reserve, the truncated flag, and the
  validly-written &str; deliberately omits the raw target bytes, as
  they may be uninitialized.

Changed

• Breaking: WriteBuf::finish, WriteBuf::finish_with, and
  WriteBuf::finish_with_or now return Result<&str, Truncated<'_>>
  instead of Result<usize, usize>. The new shape gives callers the
  validated string slice directly without a separate from_utf8 step
  on the underlying buffer.
• Breaking: finish_with and finish_with_or now require
  impl AsRef<str> for the suffix arguments (previously
  impl AsRef<[u8]>). This keeps the UTF-8 invariant at the type level
  rather than relying on a runtime check.
• Breaking: Minimum supported Rust version raised to 1.81 (for
  stable core::error::Error); edition is now 2021.

Removed

• Breaking: rfind_utf8_end is no longer re-exported from the
  crate root. It remains as a crate-internal helper.