fix(parser): restrict block types in default table cells to match asciidoctor

Default table cells now treat list markers, delimited blocks, toc macros, and
page breaks as literal text instead of parsing them as blocks. Only cells with
the 'a' (AsciiDoc) style get full block parsing.

This fixes the mismatch where `| * item` was parsed as a list instead of
literal text "* item".

Author: nlopes

CHANGELOG.md

@@ -66,6 +66,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   the parser based on each passthrough's own substitution settings. ([#291])
 - Verbatim blocks (listing/literal) now correctly skip typography replacements by default,
   matching asciidoctor behavior. Previously, smart quotes were incorrectly applied.
+- HTML5 compliance: removed self-closing syntax (`<col />` → `<col>`, `<img />` → `<img>`)
+  and deprecated `frameborder` attribute from iframes.
 
 ### Changed
 
@@ -146,6 +148,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Paragraphs no longer incorrectly split when a line starts with inline passthrough
   syntax like `+>+`. The list continuation lookahead now only matches actual
   continuation markers (standalone `+` followed by whitespace/EOL/EOF).
+- Default table cells now treat list markers, delimited blocks, toc macros, and page
+  breaks as literal text instead of parsing them as blocks. Only cells with the `a`
+  (AsciiDoc) style get full block parsing, matching asciidoctor behavior.
 
 ### Changed