[plimeor]

Four changes, kept as separate commits so each lands in the changelog on its own.

feat!: open a block only at a marker followed by a space, and drop setext headings

A paragraph that starts with #, -, 1. or > and no space now reads as a paragraph, so text typed into one is not read back as another block. #, list markers and an opening > open a block only when followed by a space or tab. Inside an open quote, a bare > still continues it. Setext headings are gone. Decision 0019 supersedes 0018.

Breaking:

• HeadingKind and Heading::kind are removed; Heading::with_source takes no kind; the wasm heading has no kind.
• #, list markers and an opening > need a space or tab.
• Empty blocks are written # , - , > .
• Validation refuses items whose first line reads as a break with the bullet.

fix(serialize): write a fence's info string right after the fence

A code block written without its source now opens ```bash instead of ``` bash; the space stays only before an info string that opens with the fence's own char. Five canonical goldens move by that space.

fix(serialize): keep a table's rows when its alignments change, and blank lines and breaks moved in place

• A table whose alignments changed keeps its rows' source and writes the new colons around the delimiter row's dashes in place (decision 0020 supersedes 0017).
• Text given to a cell empty in the source takes one space on either side; a cell the source row lacks is written after the row with its pipe.
• A --- break that comes to open the document keeps its source while no later line closes it as frontmatter.
• A blank line that opened its container in the source no longer panics (subtraction overflow) or copies a wrong line when a block is put before it.
• A block written first whose source opens with code indentation is rendered, as it is after another block.

feat(wasm): carry what character references and shortcodes stand for

A characterReference from the binding holds value (what CharacterReference::value() decodes) and a shortcode holds glyph (what Shortcode::glyph() gives), each null where Rust returns None. toMarkdown ignores them.

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