fix(agent): 区分规格入口点击目标不唯一 (#209)

解析阶段已收敛到唯一语义候选，点击阶段的歧义来自控件树对该目标的
重复匹配。原文案沿用「候选不唯一」，与同串中 specEntryCandidates=1
的证据自相矛盾，不利于事后排查，改为「点击目标不唯一」。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NTDbDcwbDw1TSAcE6wfh2F

android/app/src/main/java/cn/ilapage/goauto/agent/automation/PurchaseRehearsalExecutor.kt

@@ -289,9 +289,12 @@ class PurchaseRehearsalExecutor(
         }
         val click = driver.clickFreshDetailed(target)
         when (click.result) {
+            // The parser already narrowed to a single semantic candidate; the
+            // ambiguity here comes from the live tree matching that target more
+            // than once at click time, so the wording must not claim otherwise.
             FreshActionResult.AMBIGUOUS -> return failure(
                 SPEC_ENTRY_TARGET_AMBIGUOUS,
-                "规格入口候选不唯一 [${specEntryEvidence(screen, candidates.size)}]",
+                "规格入口点击目标不唯一 [${specEntryEvidence(screen, candidates.size)}]",
             )
             FreshActionResult.SUCCESS -> Unit
             else -> return failure(SPEC_ENTRY_CLICK_FAILED, click.reason.specEntrySubreason())

android/app/src/test/java/cn/ilapage/goauto/agent/PurchaseRehearsalExecutorTest.kt

@@ -623,7 +623,7 @@ class PurchaseRehearsalExecutorTest {
 
         assertEquals("PURCHASE_SPEC_ENTRY_TARGET_AMBIGUOUS", ambiguous.errorCode)
         assertEquals(
-            "规格入口候选不唯一 [specEntryCandidates=1;explicit=1;nested=0;bottomPurchase=0;panelAlreadyOpen=false;reviewPage=false;pageEvidence=true]",
+            "规格入口点击目标不唯一 [specEntryCandidates=1;explicit=1;nested=0;bottomPurchase=0;panelAlreadyOpen=false;reviewPage=false;pageEvidence=true]",
             ambiguous.message,
         )
     }