Add frontmatter, markdown, path, xml, rss, and web packages

Sync local packages into the registry repo and update index.json
and README.md to include all 9 packages.

packages/markdown/README.md

@@ -0,0 +1,82 @@
+# markdown
+
+A Markdown to HTML converter for [Lux](https://github.com/thebrandonlucas/lux).
+
+## Install
+
+```bash
+lux pkg add markdown --git https://git.qrty.ink/blu/markdown
+```
+
+## Usage
+
+```lux
+import markdown
+
+fn main(): Unit with {Console} = {
+    let html = markdown.toHtml("# Hello **world**")
+    Console.print(html)
+}
+
+let _ = run main() with {}
+```
+
+## API
+
+### `toHtml(markdown: String): String`
+
+Convert a full markdown document to HTML.
+
+### `inlineToHtml(text: String): String`
+
+Convert inline markdown only (bold, italic, links, etc.) without block-level processing.
+
+### `escapeHtml(s: String): String`
+
+Escape HTML entities (`&`, `<`, `>`).
+
+## Supported Markdown
+
+### Block elements
+- Headings (`# h1` through `#### h4`)
+- Paragraphs (auto-wrapped in `<p>`)
+- Fenced code blocks (` ``` ` with optional language)
+- Blockquotes (`> text`)
+- Unordered lists (`- item`)
+- Ordered lists (`1. item`)
+- Horizontal rules (`---`, `***`, `___`)
+- Images on their own line (`![alt](src)`)
+- Raw HTML pass-through (lines starting with `<`)
+
+### Inline elements
+- **Bold** (`**text**`)
+- *Italic* (`*text*` or `_text_`)
+- ~~Strikethrough~~ (`~~text~~`)
+- `Code` (`` `code` ``)
+- [Links](url) (`[text](url)`)
+- Images (`![alt](src)`)
+- Raw HTML tags pass through
+
+### Special features
+- Headings inside list items (`- ### Title` renders correctly)
+- Nested inline formatting (`**[bold link](url)**`)
+- Code blocks with syntax highlighting class (`language-*`)
+- Recursive blockquote content processing
+
+## Running Tests
+
+```bash
+lux test.lux
+```
+
+## Known Limitations
+
+- No nested lists (indented sub-items)
+- No reference-style links (`[text][ref]`)
+- No tables
+- No task lists (`- [ ] item`)
+- The C backend does not support module imports; use the interpreter (`lux`) or include the source directly for compiled binaries
+
+## License
+
+MIT