fix(coding-agent): move #2909 changelog entry to [Unreleased]

The quoted-path fix entry was appended under the already-released [16.0.6] section (creating a duplicate ### Fixed heading); released sections are immutable per repo convention. Move it to [Unreleased] and normalize the bullet.

packages/coding-agent/CHANGELOG.md

@@ -53,6 +53,10 @@
 - Fixed `/model` in the TUI to open the model setup picker again, leaving `/switch` as the temporary session model switcher ([#2933](https://github.com/can1357/oh-my-pi/issues/2933)).
 - Fixed OpenCode Go sessions recording per-request cost history so `/usage` can show local cap utilization. ([#2942](https://github.com/can1357/oh-my-pi/issues/2942))
 
+### Fixed
+
+- Support quoted file paths with spaces (such as default macOS screenshots) in file mentions and `@`-prefixed CLI arguments ([#2909](https://github.com/can1357/oh-my-pi/pull/2909)).
+
 ## [16.0.6] - 2026-06-18
 
 ### Added
@@ -105,9 +109,6 @@
 ### Security
 
 - Secured PDF image reads by validating requested image members against the extracted member list before opening files and refusing traversal-style names
-### Fixed
-
- - Support quoted file paths with spaces (such as default macOS screenshots) in file mentions and `@`-prefixed CLI arguments ([#2909](https://github.com/can1357/oh-my-pi/pull/2909)).
 
 ### Fixed