fix(cli/boulder): strip ANSI in formatter test so FORCE_COLOR CI passes

picocolors emits ANSI escape codes when FORCE_COLOR is set (GitHub
Actions default), so the literal toContain('status: active') assertion
fails against the wrapped 'status: \x1b[36mactive\x1b[39m' output.
Reuse the existing stripAnsi helper from src/cli/doctor/format-shared.ts
in the test before assertion.

Reproduced locally with FORCE_COLOR=1 bun test src/cli/boulder/formatter.test.ts.

src/cli/boulder/formatter.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect, it } from "bun:test"
 
+import { stripAnsi } from "../doctor/format-shared"
 import { formatJsonOutput, formatTextOutput } from "./formatter"
 import type { BoulderCliResult } from "./types"
 
@@ -28,7 +29,7 @@ describe("boulder formatter", () => {
       ],
     }
 
-    const textOutput = formatTextOutput(result)
+    const textOutput = stripAnsi(formatTextOutput(result))
     expect(textOutput).toContain("boulder progress")
     expect(textOutput).toContain("plan: alpha")
     expect(textOutput).toContain("status: active")