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backstage release v0.101.0

Feb 2, 2026 Developer Portal backstage v0.101.0

Added

Add OAuth2 PKCE authentication support for MCP servers with custom authenticator and CIMD router.
Add authentication provider support and multi-installation features for MCP servers.
Add MCP resources loading exposed as callable tools.

Fixed

Fix GitOpsCard source URL generation for Flux CD revision formats like main@sha1:abc123 and sha256:abc123.
Improve container registry error handling with user-friendly messages for missing repositories. See ./docs/releases/v0.101.0-changelog.md for more information.