Initial commit

Assisted-by: GLM 5.3

internal/markdown/testdata/corpus/basic.md

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+Hello *world* and **bold**

internal/markdown/testdata/corpus/code.md

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+Prose before.
+
+```go
+fmt.Println("hi")
+```
+
+    indented code
+
+Inline `code` too.

internal/markdown/testdata/corpus/figure.md

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+![alt text](/media/pic.webp "Caption here")
+
+![plain](/media/other.webp)

internal/markdown/testdata/corpus/headings.md

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+# Title One
+
+Some [link](https://example.com) here.
+
+## Sub & "head"
+
+### Deep
+
+Text.

internal/markdown/testdata/corpus/hostile.md

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+<script>alert(1)</script>
+
+<img src="/media/x.webp" onerror="alert(1)">
+
+[click](javascript:alert(1))
+
+<iframe src="https://evil"></iframe>

internal/markdown/testdata/corpus/math.md

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+# Math
+
+Inline radiation: $E = h\nu$ redshifted by $\sqrt{g_{tt}}$.
+
+$$E = h\nu\,\sqrt{g_{tt}(r)} = \text{konst.} \quad (1)$$
+
+The metric reads $ds^2 = -g_{tt}(r)c^2dt^2 + dr^2 + r^2d\Omega^2$, and a
+photon loses energy as $\frac{E(t)}{E_0} = e^{-Ht}$.
+
+$$1+z = \frac{\nu(r_1)}{\nu(r_2)} = \sqrt{\frac{g_{tt}(r_1)}{g_{tt}(r_2)}}. \quad (2)$$
+
+Prices are not math: the ticket costs $5 and the guide $10 per group.
+
+The metric in prose right above its display form
+$$g_{tt}(r) = 1 - \frac{r_s}{r}$$
+continues in a sentence after it.
+
+$$r_h = \frac{\sigma}{\sqrt{2\pi G \rho_{\text{amb}}}},
+\qquad M_h = \frac{2\sigma^2 r_h}{G}. \quad (7)$$
+
+An equation broken across lines keeps its prose out of mathematics
+$\nabla^2 h =
+(8\pi/\kappa a)u$: the binding is the force of a cell $\kappa a = c^4/G$,
+and the source is the energy.
+
+$$\raisebox{1em}{E} = h\nu$$
+
+Inline degradation too: $\raisebox{1em}{E}$ stays visible where it stands.

internal/markdown/testdata/corpus/mermaid.md

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+# Diagrams
+
+A flowchart of the observed cycle:
+
+```mermaid
+flowchart LR
+    A[Observation] --> B{Hypothesis}
+    B -->|confirmed| C[Theory]
+    B -->|refuted| D[Revised model]
+```
+
+A sequence of a measurement:
+
+```mermaid
+sequenceDiagram
+    participant O as Observer
+    participant S as Source
+    O->>S: request spectrum
+    S-->>O: redshifted light
+    Note over S: proper time runs slow
+```
+
+A type the renderer does not carry stays source:
+
+```mermaid
+stateDiagram-v2
+    [*] --> calm
+```

internal/markdown/testdata/corpus/misc.md

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+~~struck~~ text
+
+> quote
+
+Footnote[^1]
+
+[^1]: note text
+
+Term
+: definition

internal/markdown/testdata/corpus/table.md

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+| a | b |
+|---|---|
+| 1 | 2 |

internal/markdown/testdata/corpus/tasklist.md

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+- [x] done
+- [ ] todo
+
+1. ordered
+2. items