fix(cli): hide commit-message git windows on Windows (#7692)

Prevent cmd.exe flashes when commit message generation shells out to git on Windows and add a regression test for the subprocess flags.

packages/opencode/src/commit-message/git-context.ts

@@ -133,6 +133,7 @@ function git(args: string[], cwd: string): string {
     cwd,
     stdout: "pipe",
     stderr: "pipe",
+    windowsHide: true, // kilocode_change - prevent cmd.exe flash on Windows
   })
   return result.stdout.toString().trimEnd()
 }
@@ -144,7 +145,7 @@ function parseNameStatus(output: string): Array<{ status: string; path: string }
     let path: string
     if (status!.startsWith("R")) {
       // Rename: rest = ["old.ts", "new.ts"], use the new path
-      path = rest[1] ?? rest[0]
+      path = rest[1] ?? rest[0] ?? ""
     } else {
       path = rest.join("\t")
     }

packages/opencode/test/kilocode/commit-message-windows.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, spyOn, test } from "bun:test"
+import { getGitContext } from "../../src/commit-message/git-context"
+
+describe("commit-message git context", () => {
+  test("hides Windows console windows for git subprocesses", async () => {
+    const out = new Map([
+      ["branch --show-current", "main"],
+      ["log --oneline -5", "abc1234 init"],
+      ["diff --name-status --cached", "M\tsrc/index.ts"],
+      ["diff --cached -- src/index.ts", "+console.log('hi')"],
+    ])
+
+    const spy = spyOn(Bun, "spawnSync").mockImplementation(((cmd: unknown, opts: unknown) => {
+      const key = Array.isArray(cmd) ? cmd.slice(1).join(" ") : ""
+      return {
+        stdout: Buffer.from(out.get(key) ?? ""),
+        stderr: Buffer.alloc(0),
+      } as never
+    }) as unknown as typeof Bun.spawnSync)
+
+    try {
+      await getGitContext("/repo")
+
+      expect(spy).toHaveBeenCalledTimes(4)
+      for (const call of spy.mock.calls) {
+        expect(call[0]).toEqual(expect.arrayContaining(["git"]))
+        expect(call[1]).toMatchObject({
+          cwd: "/repo",
+          stdout: "pipe",
+          stderr: "pipe",
+          windowsHide: true,
+        })
+      }
+    } finally {
+      spy.mockRestore()
+    }
+  })
+})