docs(release): drop backticks in v1.5.0 notes to unblock CI

The release workflow inlines the notes file directly into a shell
`-f body="..."` argument, so any backticks get interpreted as command
substitution by the shell. The previous run failed with
`.hk-kit.zip: command not found`. Removing the backticks for now; a
proper fix in the workflow (heredoc / stdin) is a separate change.

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

Author: RealZST

.github/release-notes/v1.5.0.md

@@ -1,5 +1,5 @@
 ## ✨ Highlights
 
-- **Kits** — Pack skills, MCP servers, rules, and memory files into a portable Kit, then deploy the whole bundle to any project with one click. Export as `.hk-kit.zip` to share with teammates or carry across machines.
+- **Kits** — Pack skills, MCP servers, rules, and memory files into a portable Kit, then deploy the whole bundle to any project with one click. Export as a .hk-kit.zip archive to share with teammates or carry across machines.
 - **Follow system language** — A new "Follow system" option in Settings picks the UI language from your OS locale.
 - **Antigravity fixes** — Resolve skill path mapping and UI scope bleeding on the Antigravity adapter.