fix: align docs and release notes with pre-transfer state

- docs/installation.md: qualify PyPI as available 'once official
  publishing is enabled' (ownership transfer still pending)
- release.yml: use specify-cli@VERSION syntax (consistent with
  README/docs @latest form)
- PR description updated to match

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mnriem

.github/workflows/release.yml

@@ -73,7 +73,7 @@ jobs:
           Or from [PyPI](https://pypi.org/project/specify-cli/) (once published for this release):
 
           \`\`\`bash
-          uv tool install 'specify-cli==${VERSION_NO_V}'
+          uv tool install specify-cli@${VERSION_NO_V}
           \`\`\`
 
           NOTES_EOF

docs/installation.md

@@ -11,7 +11,7 @@
 ## Installation
 
 > [!NOTE]
-> The `specify-cli` package is also available on [PyPI](https://pypi.org/project/specify-cli/). PyPI publishing is performed after each GitHub release and may lag briefly. Source installs from the GitHub repository are always available immediately.
+> The `specify-cli` package will also be available on [PyPI](https://pypi.org/project/specify-cli/) once official publishing is enabled. Source installs from the GitHub repository are always available immediately.
 
 ### Persistent Installation (Recommended)
 
@@ -24,7 +24,7 @@ Install once and use everywhere. Replace `vX.Y.Z` with a tag from [Releases](htt
 uv tool install specify-cli --from git+https://github.com/github/spec-kit.git@vX.Y.Z
 ```
 
-Or install from PyPI:
+Or, once official PyPI publishing is enabled, install from PyPI:
 
 ```bash
 uv tool install specify-cli@latest