test: make unsafe test coercion explicit

Move test coercion out of a hidden global and require each test to import the helper so review tools and runtime scripts can see the unsafe boundary.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/anthropic-context-window-limit-recovery/summarize-retry-strategy.test.ts

@@ -2,6 +2,7 @@ import { afterEach, beforeEach, describe, expect, mock, test } from "bun:test"
 import { runSummarizeRetryStrategy } from "./summarize-retry-strategy"
 import type { AutoCompactState, ParsedTokenLimitError, RetryState } from "./types"
 import type { OhMyOpenCodeConfig } from "../../config"
+import { unsafeTestValue } from "../../../test-support/unsafe-test-value"
 
 type TimeoutCall = {
   handle: ReturnType<typeof setTimeout>
@@ -95,7 +96,7 @@ describe("runSummarizeRetryStrategy", () => {
     //#given
     const timeoutCalls: TimeoutCall[] = []
     globalThis.setTimeout = ((_: (...args: unknown[]) => void, delay?: number) => {
-      const handle = testCoerce<ReturnType<typeof setTimeout>>(timeoutCalls.length + 1)
+      const handle = unsafeTestValue<ReturnType<typeof setTimeout>>(timeoutCalls.length + 1)
       timeoutCalls.push({ handle, delay: delay ?? 0 })
       return handle
     }) as typeof setTimeout
@@ -132,7 +133,7 @@ describe("runSummarizeRetryStrategy", () => {
     let scheduledCallback: (() => void) | undefined
     globalThis.setTimeout = ((callback: (...args: unknown[]) => void, _delay?: number) => {
       scheduledCallback = () => callback()
-      return testCoerce<ReturnType<typeof setTimeout>>(1)
+      return unsafeTestValue<ReturnType<typeof setTimeout>>(1)
     }) as typeof setTimeout
 
     autoCompactState.pendingCompact.add(sessionID)
@@ -176,7 +177,7 @@ describe("runSummarizeRetryStrategy", () => {
     autoCompactState.emptyContentAttemptBySession.set(sessionID, 3)
     autoCompactState.retryTimerBySession.set(
       sessionID,
-      testCoerce<ReturnType<typeof setTimeout>>(1),
+      unsafeTestValue<ReturnType<typeof setTimeout>>(1),
     )
 
     //#when