Add CLAUDE.md and the test harness

CLAUDE.md records the Nova constraints this extension is built around — established by reading Nova 14.1's bundle and probing its preview server, and expensive to re-derive: no previewer extension point, generated pages must live under the preview root, dot-directories are served, and no API reaches into a preview WebView. It also flags the one unverified assumption, that a tab showing Preview still appears in nova.workspace.textEditors, with its symptom and fix. Tests/ is the harness that built the extension, kept rather than left in a scratchpad: a stubbed Nova runtime backed by the real filesystem, node suites for generation and the four close paths, and a headless-browser render test that skips itself without a browser. It caught the ./ doubling in rebased links and checkbox state not surviving serialization. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01TueXpMi7eAtgWPuMr4ii52
2026-08-20 23:02:08 -03:00
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+---
+title: Front matter should be hidden
+---
+
+# Sample Document
+
+Intro paragraph with a [relative link](./other.md), `inline code`, **bold** and a
+[TOC link](#a-second-heading).
+
+- [ ] an unchecked task
+- [x] a checked task
+- a plain item
+
+| Column | Another |
+| --- | --- |
+| one | two |
+| three | four |
+
+```js
+const answer = 42;
+```
+
+```mermaid
+graph TD
+    A[Start] --> B{Works?}
+    B -->|yes| C[Ship it]
+    B -->|no| D[Fix it]
+    D --> A
+```
+
+## A Second Heading
+
+```mermaid
+sequenceDiagram
+    Nova->>Extension: Preview Markdown
+    Extension->>Disk: write preview.html
+    Disk-->>Nova: file changed
+    Nova->>Preview: reload
+```
+
+```mermaid
+this is not valid mermaid at all {{{
+```
+
+![an image](img/logo.png)