chore(rs): bump version to 0.3.0-rc.5

First release that exercises the cross-platform Velopack pipeline
(PRs #201 + #202): per-platform channels in `velopack_bridge` paired
with per-platform `vpk pack` jobs and `packId`s in `rs--release.yml`.

A tag-push of `rs-v0.3.0-rc.5` will publish four Velopack feeds in
one GitHub release:

  releases.win.json       + win-Setup.exe       + nupkgs
  releases.osx-arm64.json + .app.zip            + nupkgs
  releases.osx-x64.json   + .app.zip            + nupkgs
  releases.linux-x64.json + AppImage            + nupkgs

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: maui1911

codescope-rs/Cargo.lock

@@ -4,7 +4,7 @@ exclude = ["vendor/gpui-terminal"]
 
 [package]
 name = "codescope-rs"
-version = "0.3.0-rc.4"
+version = "0.3.0-rc.5"
 edition = "2024"
 publish = false
 description = "CodeScope (Rust port): gpui shell that orchestrates parallel AI coding agent CLI sessions with Git worktree isolation."