[dotnet-code] Align compaction equality helpers

[github-actions]

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The original pull request description is below.

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Summary

Extracts unexported per-content comparison helpers from agent/compaction/equality.go. This keeps the existing compaction equality behavior while making the Go implementation structurally closer to .NET's ChatMessageContentEquality helper layout for future ports.

.NET Reference

• dotnet/src/Microsoft.Agents.AI/Compaction/ChatMessageContentEquality.cs - defines per-content comparison helpers used by compaction message matching.

Public API and Behavior

No public Go API changed. No intentional behavior change was made.

Tests

• go test ./agent/compaction

Notes

Rejected candidates:

• dotnet/src/Microsoft.Agents.AI.Abstractions/AgentResponse.cs / AgentResponseUpdate.cs - comparable Go response assembly already had aligned behavior; changing update metadata handling would risk observable behavior changes.
• dotnet/src/Microsoft.Agents.AI.Workflows/MessageMerger.cs - comparable Go workflow merging internals were close, but usage/raw representation parity questions were behavior-affecting rather than safe cleanup.
• dotnet/src/Microsoft.Agents.AI/Skills/* - inspected as a sampled area from the upstream directory listing, but no safer small cleanup was found before the compaction equality candidate.

The direct upstream git fetch was blocked by the environment, so the .NET reference was inspected through the read-only GitHub bridge after checking local refs.

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Show patch preview (37 of 104 lines)

From 295c1d94b107196c0eb85b6aecd0d674a7fd8147 Mon Sep 17 00:00:00 2001
X-GH-AW-Base-Commit: 4b46045b01079041f0b8f5121b4cf66a79be8bd3
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Tue, 15 Sep 2026 22:30:09 +0000
Subject: [PATCH] [dotnet-code] Align compaction equality helpers

Extract unexported content comparison helpers in compaction equality so the Go structure more closely mirrors the .NET ChatMessageContentEquality internals without changing behavior.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 agent/compaction/equality.go | 62 +++++++++++++++++++++++++-----------
 1 file changed, 43 insertions(+), 19 deletions(-)

diff --git a/agent/compaction/equality.go b/agent/compaction/equality.go
index fc0e0fb..2005f4e 100644
--- a/agent/compaction/equality.go
+++ b/agent/compaction/equality.go
@@ -46,32 +46,21 @@ func contentEqual(left, right message.Content) bool {
 	}
 	switch leftContent := left.(type) {
 	case *message.TextContent:
-		rightContent := right.(*message.TextContent)
-		return leftContent.Text == rightContent.Text
+		return textContentEqual(leftContent, right.(*message.TextContent))
 	case *message.TextReasoningContent:
-		rightContent := right.(*message.TextReasoningContent)
-		return leftContent.Text == rightContent.Text && leftContent.ProtectedData == rightContent.ProtectedData
+		return textReasoningContentEqual(leftContent, right.(*message.TextReasoningContent))
 	case *message.DataContent:
-		rightContent := right.(*message.DataContent)
-		return leftContent.MediaType == rightContent.MediaType && leftContent.Name == rightContent.Name && leftContent.Data == rightContent.Data
+		return dataContentEqual(leftContent, right.(*message.DataContent))
 	case *message.URIContent:
-		rightContent := right.(*message.URIContent)
-		return leftContent.URI == rightContent.URI && leftContent.MediaType == rightContent.MediaType
+		return uriContentEqual(leftContent, right.(*message.URIContent))
 	case
... (truncated)

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Generated by .NET-to-Go Code Portability Refactoring Agent · copilot · gpt55 · 113.9 AIC · ⌖ 13.8 AIC · ⊞ 17.8K · ◷

[michelle-clayton-work]

Pull request #1090 is linked to this issue and will close it when merged.