chore: bump version to 0.21.0

[Copilot]

Bumps all package versions from 0.20.0 to 0.21.0 across the monorepo.

Summary

Version bump to 0.21.0 across all packages using the monorepo's version management scripts.

Note: Inspector V2 is under development to address architectural and UX improvements. During this time, V1 contributions should focus on bug fixes and MCP spec compliance. See CONTRIBUTING.md for more details.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Documentation update
• Refactoring (no functional changes)
• Test updates
• Build/CI improvements

Changes Made

• Updated version field to 0.21.0 in:
  • package.json
  • client/package.json
  • server/package.json
  • cli/package.json
• Updated workspace dependency references in root package.json to ^0.21.0
• Regenerated package-lock.json via npm install

Related Issues

Testing

• Tested in UI mode
• Tested in CLI mode
• Tested with STDIO transport
• Tested with SSE transport
• Tested with Streamable HTTP transport
• Added/updated automated tests
• Manual testing performed

Test Results and/or Instructions

Ran npm run check-version — all packages confirmed at 0.21.0, workspace deps and package-lock.json in sync:

✅ All packages are at version: 0.21.0
✅ @modelcontextprotocol/inspector-cli: ^0.21.0
✅ @modelcontextprotocol/inspector-client: ^0.21.0
✅ @modelcontextprotocol/inspector-server: ^0.21.0
✅ package-lock.json version matches: 0.21.0
✅ Version consistency check passed!

Checklist

• Code follows the style guidelines (ran npm run prettier-fix)
• Self-review completed
• Code is commented where necessary
• Documentation updated (README, comments, etc.)

Breaking Changes

None.

Additional Context

Version updated using the built-in npm run update-version 0.21.0 script and verified with npm run check-version.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Bump version to 0.21.0</issue_title>
<issue_description>- Bump version to 0.21.0

• Use the npm script to verify that versions have been updated correctly</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Bump version to 0.21.0 #1111

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[cliffhall]

LGTM! 👍