v0.5.0

Breaking release implementing Ktav specification 0.5.0.

Breaking

• Typed markers :i and :f removed. Numbers, booleans, and null
  are inferred from the scalar's lexical form (spec §§ 3.6, 5.2).
  port: 8080 now yields int(8080); use port:: 8080 to keep a String.
• Comments use ## (line-start only). A single # byte is content —
  color: #FF0000 is a valid string value.
• Inline compounds {k: v, …} / [i, …] are now valid (spec § 5.8).
  The InlineNonEmptyCompound error is no longer emitted by the parser.

Added

• ktav.emit_canonical(obj) — emit the normalised (spec § 5.9)
  byte-deterministic canonical form of a Python value.
• Number literal grammar — hex (0x), octal (0o), binary (0b),
  decimal, and underscore separators; i64 overflow falls back to String.
• Eight escape sequences in inline scalars (spec § 3.7):
  \\, \,, \}, \], \{, \[, \n, \r.

Changed

• License: MIT → MIT OR Apache-2.0. Added LICENSE-APACHE;
  renamed LICENSE → LICENSE-MIT.
• Spec submodule pinned to v0.5.0.
• Picked up ktav 0.5.0.

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