[docs] Update documentation for features from 2025-12-16 #6703
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Documentation Updates - December 16-17, 2025
This PR updates the documentation based on features merged in the last 24 hours.
Features Documented
Changes Made
docs/src/content/docs/reference/frontmatter.mdto document the newmetadatafield with constraints and usage examplesdocs/src/content/docs/guides/mcps.mdto document HTTP authentication headers for MCP serversMerged PRs Referenced
Notes
The fuzzy scheduling features (#6659, #6664, #6693) are already comprehensively documented in
docs/src/content/docs/reference/triggers.mdand did not require updates. This PR focuses on the two undocumented features: metadata field and MCP HTTP headers.