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Add syntax highlighting for fenced code blocks in markdown artifacts

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Enables codehilite on the markdown renderer (Pygments, 'friendly' style,
vendored as static/themes/pygments.css) so fenced code blocks get real
syntax highlighting with zero client-side JS - matching the "themes are
CSS-only" stance in framework_artifact_rendering.md. Verified live against
the running dev instance: a fenced python block renders with highlighted
keyword/string/function spans.

This was Gap 2 from planning/2026-09-02-artifact_kind_gaps_for_frequent_agent_output.md,
picked as the first fix since it needed no new kind or design decision -
just enabling an existing markdown extension.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
peter 2026-09-02 14:39:02 +01:00
parent d9fc28aec0
commit af9ecf28a9
5 changed files with 102 additions and 2 deletions
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docs/api.md
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@ -30,7 +30,7 @@ Currently supported kinds:
|---|---|---|---|
| `html_fragment` | JSON text | Wrapped with a Daybook theme | No |
| `html_full` | JSON text | Stored as complete HTML | Yes |
| `markdown` | JSON text | Rendered to HTML and original `.md` is preserved | Yes |
| `markdown` | JSON text | Rendered to HTML (fenced code blocks get syntax highlighting) and original `.md` is preserved | Yes |
| `deck` | JSON text | Wrapped as a simple HTML slide/deck page | No |
| `image` | Multipart file | Browser image preview | No |
| `pdf` | Multipart file | Browser PDF preview | No |