chore: bump version to 0.5.1 (#277)

Patch release: in-app updater now verifies download completeness and
retries truncated downloads (#275), so a TLS-inspecting proxy / AV
middlebox clipping the archive no longer surfaces as a baffling
'Could not find EOCD' extract failure. Adds the truncated-download
resilience check to RELEASE-VALIDATION §6b (#276).

Tag v0.5.1 after this merges to trigger the release pipeline.

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

Author: maui1911

Cargo.lock

@@ -14,7 +14,7 @@ windows = "0.61"
 
 [package]
 name = "codescope"
-version = "0.5.0"
+version = "0.5.1"
 edition = "2024"
 publish = false
 description = "CodeScope: gpui shell that orchestrates parallel AI coding agent CLI sessions with Git worktree isolation."