Add `.astro` to CODE_EXTENSIONS (Astro page/component routing layer silently dropped)

[spindle79]

Feature request: .astro support in CODE_EXTENSIONS

Package: graphifyy v0.7.16
Use case: Astro marketing/content site with dynamic routing and a Sanity CMS backend (~60 .astro files for the entire page resolver, layouts, and section components)

What

detect.py:27 lists 19 source extensions including .vue and .svelte, but not .astro. Result: every .astro file is silently dropped from the AST pass. Verified on my repo — graphify update . --force ran on 374 files, 0 of them .astro:

$ python3 -c "import json; g=json.load(open('graphify-out/graph.json'));
  print('astro nodes:', sum(1 for n in g['nodes'] if '.astro' in n.get('source_file','')))"
astro nodes: 0

In my repo that means the page resolver (src/pages/[...slug].astro), every page, and every section component (src/components/Sections/*.astro) — i.e., the entire rendering layer — is invisible. Queries like "how does Sanity section type X render?" dead-end at the API boundary because the graph has no nodes downstream of it.

Why it matters

Astro has had GitHub-trending traction since 2024 and is the default static-site framework on Vercel/Netlify quickstart paths. With .mdx accepted (closes #428) and .vue/.svelte already supported (#254), .astro is the conspicuous remaining gap for the modern static-site ecosystem.

Suggested approach

Tree-sitter has a community grammar at virchau13/tree-sitter-astro. It parses the frontmatter (TS), HTML body, and embedded expressions. Same shape as the existing .vue/.svelte SFC handling.

Minimum-viable change (parity with .vue support):

# detect.py:27
CODE_EXTENSIONS = {
    ..., '.vue', '.svelte', '.astro', ...
}

Plus the grammar registration wherever .vue/.svelte are wired in for the SFC extraction path. Extracting just the frontmatter <script> block and the component-name imports would cover ~80% of the cross-file edges; full HTML/expression parsing is a stretch goal.

Workaround in the meantime

For users on Astro sites — document the gap in CLAUDE.md/AGENTS.md so the assistant falls back to grep for rendering questions. Not user-friendly but unblocks.