* Make the nightly publishing script use the stable channel of cline-nightly.
* Address PR review feedback from Greptile and Copilot
- Reject unknown CLI flags with an error message, preventing typos like
--prerelease from silently publishing to the wrong channel (Greptile)
- Rename 'stable' to 'release' throughout docs, help text, and log
messages to match VS Code Marketplace terminology (Copilot)
- Rename workflow step from 'Publish Extension as Pre-release' to
'Publish Nightly Extension' since it now publishes to the release
channel by default (Greptile)
Dominic Cooney
8d020e89e6