chore: release v0.6.0

[github-actions]

🤖 New release

• markdown-syntax: 0.5.0 -> 0.6.0 (⚠ API breaking changes)

⚠ markdown-syntax breaking changes

--- failure constructible_struct_adds_field: struct exhaustively constructible through public API adds field ---

Description:
A pub struct that could be exhaustively constructed with a literal using only public API has a new pub field, breaking existing exhaustive literals.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field Diagnostic.path in /tmp/.tmp9jizia/markdown-syntax/src/diagnostic.rs:46
  field Diagnostic.path in /tmp/.tmp9jizia/markdown-syntax/src/diagnostic.rs:46
  field Diagnostic.path in /tmp/.tmp9jizia/markdown-syntax/src/diagnostic.rs:46

Changelog

0.6.0 - 2026-10-18

Added

• [breaking] name the node of each validation diagnostic, and add Block::children (#28)

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