docs(coding-agent): document Ctrl+G external editor shortcut

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- **External editor support**: Press `Ctrl+G` to edit your message in an external editor. Uses `$VISUAL` or `$EDITOR` environment variable. On successful save, the message is replaced; on cancel, the original is kept. ([#266](https://github.com/badlogic/pi-mono/pull/266) by [@aliou](https://github.com/aliou))
+
 ## [0.25.2] - 2025-12-21
 
 ### Fixed

packages/coding-agent/README.md

@@ -230,6 +230,7 @@ The agent reads, writes, and edits files, and executes commands via bash.
 | Ctrl+P | Cycle models (scoped by `--models`) |
 | Ctrl+O | Toggle tool output expansion |
 | Ctrl+T | Toggle thinking block visibility |
+| Ctrl+G | Edit message in external editor (`$VISUAL` or `$EDITOR`) |
 
 ### Bash Mode