Update cheatsheets

tldr/opencode-export

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# opencode export
+
+> Export session data as JSON.
+> More information: <https://opencode.ai/docs/cli#export>.
+
+- Export a specific session to a file:
+
+`opencode export {{session_id}} > {{path/to/session}}.json`
+
+- Export a session interactively (output in `stdout`):
+
+`opencode export`
+
+- Display help:
+
+`opencode export {{[-h|--help]}}`