fix(consult): BUG-945~949 领域截断、思考分片、Pass 4 按模式分流

schema 上限与执行上限解耦；校正思考改分片门；日期观察不删字，保证句与无分钟个人盘退回重写。

frontend/tests/rectification-step-answer.test.ts

@@ -8,6 +8,7 @@ import {
   shouldPublishStepText,
 } from "../src/lib/rectification-agentic/v9/step-answer.ts";
 import { mapStreamChunkToPhase, mapStreamChunkToThinking } from "../src/lib/rectification-agentic/v9/stream-mapping.ts";
+import { createThinkingFragmentAssembler } from "../src/lib/think-step-gate.ts";
 import { PUBLIC_RECTIFICATION_TOOLS } from "../src/lib/rectification-agentic/v9/public-receipt.ts";
 
 function isPublicTool(name: string): boolean {
@@ -44,6 +45,13 @@ test("never publishes reasoning-delta to the browser", () => {
   assert.ok(mapStreamChunkToThinking(chunk("reasoning-delta", { text: "先核对经历。" }) as never));
 });
 
+test("consecutive Chinese reasoning fragments assemble into a visible thinking line", () => {
+  const assembler = createThinkingFragmentAssembler();
+  assert.equal(assembler.push("The proposedKind value was rejected"), null);
+  assert.equal(assembler.push("先核"), null);
+  assert.equal(assembler.push("对经历。"), "先核对经历。");
+});
+
 test("publishes only the terminal no-tool step as assistant text", () => {
   const state = createStepAnswerState();
   applyStepAnswerChunk(state, chunk("step-start"), isPublicTool);