tweak: ensure auto continuing compaction is tracked as agent initiated for github copilot (#22567)

Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>

packages/opencode/src/plugin/github-copilot/copilot.ts

@@ -355,7 +355,15 @@ export async function CopilotAuthPlugin(input: PluginInput): Promise<Hooks> {
         })
         .catch(() => undefined)
 
-      if (parts?.data.parts?.some((part) => part.type === "compaction")) {
+      if (
+        parts?.data.parts?.some(
+          (part) =>
+            part.type === "compaction" ||
+            // Auto-compaction resumes via a synthetic user text part. Treat only
+            // that marked followup as agent-initiated so manual prompts stay user-initiated.
+            (part.type === "text" && part.synthetic && part.metadata?.compaction_continue === true),
+        )
+      ) {
         output.headers["x-initiator"] = "agent"
         return
       }

packages/opencode/src/session/compaction.ts

@@ -345,6 +345,10 @@ When constructing the summary, try to stick to this template:
                 messageID: continueMsg.id,
                 sessionID: input.sessionID,
                 type: "text",
+                // Internal marker for auto-compaction followups so provider plugins
+                // can distinguish them from manual post-compaction user prompts.
+                // This is not a stable plugin contract and may change or disappear.
+                metadata: { compaction_continue: true },
                 synthetic: true,
                 text,
                 time: {

packages/opencode/test/session/compaction.test.ts

@@ -843,6 +843,7 @@ describe("session.compaction.process", () => {
           expect(last?.parts[0]).toMatchObject({
             type: "text",
             synthetic: true,
+            metadata: { compaction_continue: true },
           })
           if (last?.parts[0]?.type === "text") {
             expect(last.parts[0].text).toContain("Continue if you have next steps")