chore: update backend changelog

[b4s36t4]

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[Copilot]

Copilot review overview

🟡 Changes recommended

Required assertion artifacts are missing, and several linked API guides do not document the announced behavior.

Review effort: Balanced
Findings: 4

Open (4)

• Add release assertion artifacts for v1.27.0 and v1.28.0 · New
• Document agentSearch and deployment_slug filters · New
• Update guide for allow-listed model parameters · New
• Add API reference for guardrail endpoints and filters · New

What changed in this PR

Updates the Backend changelog with releases 1.27.0 and 1.28.0.

Changes:

• Adds release highlights, fixes, and documentation links.
• Updates the sidebar version to 1.28.0.

File	Description
changelog/​backend.mdx	Adds Backend 1.27.0 and 1.28.0 release notes.

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[Copilot]

Copilot review overview

🔵 Needs a closer look

Required release assertions and actionable documentation for several API changes are missing.

Review effort: Balanced
Findings: 1

Open (1)

• Add release assertion artifacts for v1.27.0 and v1.28.0

Resolved since last review (3)

• Add API reference for guardrail endpoints and filters
• Update guide for allow-listed model parameters
• Document agentSearch and deployment_slug filters

Previously missed (1)

In code that hasn't changed since last review

Specify fields removed from the export response

changelog/​backend.mdx:18

“A trimmed set of fields” does not identify which response fields were removed, so API consumers cannot assess whether this release breaks their export-list parsing. List the omitted/remaining fields or link to a verified response schema that makes the new shape explicit.

This issue also appears in the following locations of the same file:

• line 25
• line 63