fix(atlas): exclude node_modules from verification git diff --stat (#3215)

Atlas verification reminders instructed 'git diff --stat' which
included node_modules noise in the output. Added pathspec exclude
to both VERIFICATION_REMINDER and VERIFICATION_REMINDER_GEMINI
templates.

🤖 Generated with OhMyOpenCode assistance
https://github.com/code-yeongyu/oh-my-opencode

src/hooks/atlas/system-reminder-templates.test.ts

@@ -1,5 +1,9 @@
 import { describe, it, expect } from "bun:test"
-import { BOULDER_CONTINUATION_PROMPT } from "./system-reminder-templates"
+import {
+  BOULDER_CONTINUATION_PROMPT,
+  VERIFICATION_REMINDER,
+  VERIFICATION_REMINDER_GEMINI,
+} from "./system-reminder-templates"
 
 describe("BOULDER_CONTINUATION_PROMPT", () => {
   describe("checkbox-first priority rules", () => {
@@ -35,3 +39,15 @@ describe("BOULDER_CONTINUATION_PROMPT", () => {
     })
   })
 })
+
+describe("VERIFICATION_REMINDER", () => {
+  it("contains node_modules exclusion pathspec in git diff command", () => {
+    expect(VERIFICATION_REMINDER).toContain(":!node_modules")
+  })
+})
+
+describe("VERIFICATION_REMINDER_GEMINI", () => {
+  it("contains node_modules exclusion pathspec in git diff command", () => {
+    expect(VERIFICATION_REMINDER_GEMINI).toContain(":!node_modules")
+  })
+})