fix(omp): reopened chats no longer show extra "Custom message" rows (#6198)

After a daemon restart, an OMP chat replays from its session file. Three
kinds of entries that the live timeline never shows were replayed as
collapsed "Custom message" rows:

- the rule-violation reminder OMP adds after a tool call matches one of
  its rules, a developer message that opens with
  <system-reminder reason="rule_violation" ...>, while only the bare
  <system-reminder> tag was hidden
- the ttsr_injection entry OMP records alongside that reminder
- the fileMention message an @-mentioned file adds, and the other OMP
  message roles the live timeline drops

Closes #6131

Co-authored-by: paseo-bot[bot] <266920839+paseo-bot[bot]@users.noreply.github.com>

packages/server/src/server/agent/providers/omp/history-mapper.test.ts

@@ -252,6 +252,90 @@ describe("OMP history mapper", () => {
     ]);
   });
 
+  test("replays a rule-violation run with the same rows the live timeline showed", async () => {
+    const dir = mkdtempSync(join(tmpdir(), "omp-rule-reminder-history-"));
+    const sessionFile = join(dir, "session.jsonl");
+    writeFileSync(
+      sessionFile,
+      [
+        { type: "session", id: "root" },
+        {
+          type: "message",
+          id: "prompt",
+          parentId: "root",
+          message: {
+            role: "user",
+            content: "Read @notes.md, then write tiny.ts",
+          },
+        },
+        {
+          type: "message",
+          id: "mention",
+          parentId: "prompt",
+          message: {
+            role: "fileMention",
+            files: [
+              {
+                path: "notes.md",
+                content: "[notes.md#468D]\n1:# notes",
+                lineCount: 1,
+              },
+            ],
+          },
+        },
+        {
+          type: "ttsr_injection",
+          id: "injection",
+          parentId: "mention",
+          injectedRules: ["ts-no-tiny-functions"],
+        },
+        {
+          type: "message",
+          id: "rule-reminder",
+          parentId: "injection",
+          message: {
+            role: "developer",
+            content: [
+              {
+                type: "text",
+                text: '<system-reminder reason="rule_violation" rule="ts-no-tiny-functions" path="builtin-defaults:ts-no-tiny-functions">\nAvoid tiny functions.\n</system-reminder>',
+              },
+            ],
+          },
+        },
+        {
+          type: "message",
+          id: "answer",
+          parentId: "rule-reminder",
+          message: {
+            role: "assistant",
+            content: [{ type: "text", text: "FINAL_ANSWER" }],
+          },
+        },
+      ]
+        .map((entry) => JSON.stringify(entry))
+        .join("\n"),
+    );
+    const events: AgentStreamEvent[] = [];
+    for await (const event of streamOmpHistory({
+      sessionFile,
+      provider: "omp",
+    }))
+      events.push(event);
+    expect(events.map((event) => event.item)).toEqual([
+      {
+        type: "user_message",
+        text: "Read @notes.md, then write tiny.ts",
+        messageId: "prompt",
+      },
+      {
+        type: "assistant_message",
+        text: "FINAL_ANSWER",
+        messageId: "omp-history-assistant-1",
+      },
+    ]);
+  });
+
   test("coalesces replayed subagent poll calls by target set", async () => {
     const events = await collectHistory([
       {

packages/server/src/server/agent/providers/omp/history.ts

@@ -360,8 +360,7 @@ function mapEntryMessage(entry: OmpSessionEntry): OmpAgentMessage | null {
         content.length === 1 &&
         content[0]?.type === "text" &&
         typeof content[0].text === "string" &&
-        content[0].text.trimStart().startsWith("<system-reminder>") &&
+        isSystemReminder(content[0].text)
-        content[0].text.trimEnd().endsWith("</system-reminder>")
       ) {
         return null;
       }
@@ -370,6 +369,19 @@ function mapEntryMessage(entry: OmpSessionEntry): OmpAgentMessage | null {
     if (["user", "assistant", "toolResult", "custom", "bashExecution"].includes(message.role)) {
       return message as unknown as OmpAgentMessage;
     }
+    // OMP roles the live timeline does not render either, such as the fileMention that carries
+    // an @-mentioned file's content.
+    if (
+      [
+        "pythonExecution",
+        "hookMessage",
+        "branchSummary",
+        "compactionSummary",
+        "fileMention",
+      ].includes(message.role)
+    ) {
+      return null;
+    }
     return visibleFallback(message.role, message);
   }
   if (entry.type === "custom_message") {
@@ -399,6 +411,13 @@ function mapCustomMessageEntry(entry: OmpSessionEntry): OmpAgentMessage | null {
   } as OmpAgentMessage;
 }
 
+// OMP's rule-violation reminder carries attributes: <system-reminder reason="rule_violation" ...>
+function isSystemReminder(text: string): boolean {
+  return (
+    /^<system-reminder[\s>]/.test(text.trimStart()) && text.trimEnd().endsWith("</system-reminder>")
+  );
+}
+
 function isControlEntryType(type: string): boolean {
   return (
     type === "session" ||
@@ -410,6 +429,7 @@ function isControlEntryType(type: string): boolean {
     type === "system_prompt" ||
     type === "model_change" ||
     type === "thinking_level_change" ||
+    type === "ttsr_injection" ||
     type === "tool_execution" ||
     type.startsWith("tool_execution_")
   );