v1.0.0

Breaking Changes

• MarkdownBlockquote redesigned — No longer extends MarkdownTextElement. Now acts as a block element container (like MarkdownList) with an exposed BlockElements list. Convenience constructors for string and MarkdownInlineElement are preserved (auto-wrap in MarkdownParagraph).
• Dawn.Guard dependency removed — Replaced with a native internal ArgumentValidator helper. No external dependencies for validation.

New Features

• Nested blockquotes — MarkdownBlockquote now accepts IMarkdownBlockElement items, enabling nested quotes and mixed content (paragraphs, lists, code blocks, other blockquotes).
• Line breaks — New MarkdownLineBreak inline element for hard line breaks (<br>), with AppendLineBreak() extension on MarkdownText.
• Pretty-printed tables — MarkdownTable.ToPrettyString() and IMarkdownDocument.ToPrettyString() render tables with aligned columns.

Improvements

• Nullable reference types — Enabled <Nullable>enable</Nullable> across the solution.
• Table cell trimming — MarkdownTableHeader and MarkdownTableRow now trim cell content in ToString().
• Performance — Fixed O(n^2) string concatenation in MarkdownTableHeader.ToString() with StringBuilder. Added invalidate-on-write cache to MarkdownText.Text. Eliminated null array elements in capacity constructors.
• Null validation — Added guards on MarkdownLink.Url and MarkdownCode.Language public setters.
• Project reorganization — Source and test files organized into logical folders: Abstractions/, Blocks/, Inlines/, Lists/, Tables/.

0.2.0

add extensions methodes (#2) +semver: minor

0.1.1

Init project (#1)