chore: bump version to 0.5.0 (#273)

Minor release covering everything since v0.4.0: the working-tree
diff viewer (Ctrl+Shift+D, #266), tall-sidebar layout clamp (#262),
theme repaint of running terminals (#263), OSC 52 clipboard support
so CLI agents can write the clipboard (#264), Ctrl+clickable file
paths in terminal output (#265), paste support in all dialog text
fields (#268), and keyboard-focus restore after closing dialogs or
the command palette (#271).

Tag v0.5.0 after this merges to trigger the release pipeline. The
RELEASE-VALIDATION §6 dev-mode archive-extraction regression check
runs before tagging.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: maui1911

Cargo.lock

@@ -14,7 +14,7 @@ windows = "0.61"
 
 [package]
 name = "codescope"
-version = "0.4.0"
+version = "0.5.0"
 edition = "2024"
 publish = false
 description = "CodeScope: gpui shell that orchestrates parallel AI coding agent CLI sessions with Git worktree isolation."