docs: Mintlify MDX docs + docs.json; bump Speakeasy to 1.787.0 (#382)

docs/components/reasoningdetailunion.mdx

@@ -0,0 +1,27 @@
+---
+title: "ReasoningDetailUnion"
+---
+
+Reasoning detail union schema
+
+
+## Supported Types
+
+### `components.ReasoningDetailEncrypted`
+
+```python
+value: components.ReasoningDetailEncrypted = /* values here */
+```
+
+### `components.ReasoningDetailSummary`
+
+```python
+value: components.ReasoningDetailSummary = /* values here */
+```
+
+### `components.ReasoningDetailText`
+
+```python
+value: components.ReasoningDetailText = /* values here */
+```
+