Update registry server version

[MattBabbage]

This pull request updates the release workflow and configuration for the GitHub MCP server, focusing on improving tag selection logic and updating metadata to match the latest schema and registry conventions.

[Copilot]

Pull Request Overview

This PR updates the registry server configuration and release workflow to improve version tag handling and align with the latest MCP schema conventions. The changes focus on consolidating registry configuration fields and ensuring only stable release tags are selected during the release process.

Key changes:

• Updated MCP schema version from 2025-09-29 to 2025-10-17
• Consolidated OCI registry configuration by merging separate fields into a single identifier
• Improved tag selection regex to exclude pre-release versions

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
server.json	Updated schema version and consolidated OCI registry configuration into a single identifier field
.github/workflows/registry-releaser.yml	Modified tag selection regex to exclude pre-release versions by requiring exact semver format

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}