Gate `completion/complete` on the server's `completions` capability
instead of `prompts`.
closes#845
## Motivation and Context
A server that declares `completions` but not `prompts` is currently
rejected for completion. Details in #845.
## How Has This Been Tested?
New `ClientAssertCapabilityTest` cases; they fail on `main` and pass
with this change. `apiCheck` / `ktlintCheck` / `detekt` pass.
## Breaking Changes
None.
## Types of changes
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
## Checklist
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [x] I have added appropriate error handling
- [x] I have added or updated documentation as needed
Co-authored-by: Pavel Gorgulov <devcrocod@gmail.com>
19db4b04e3