refactor(pi-compaction): 改为压力触发的观察遮蔽与空闲阈值整段摘要

原实现对所有工具结果（含 read）在下一次请求即替换为约 4K 的首尾存根，
不看上下文压力，导致模型看不到大文件中段；后台逐条语义摘要又反复改写
历史、打碎 prompt 缓存。参照 Anthropic 上下文编辑、Manus 与 JetBrains
观察遮蔽研究重构为：
- L2：上下文达到阈值时在 turn_end 批量提交 Pi 原生 context_edit，把最近
  keepRecentTurns 轮之外的旧 toolResult 换成确定性占位符；trigger/target
  回差与 minClearTokens 保证少触发、一次清够；原始条目保留，可经
  context_tree_query 取回
- L3：空闲 agent_settled 且超过绝对阈值时调用一次 ctx.compact
- 阈值按绝对 token 计并受窗口比例约束，默认针对 1M 窗口（DeepSeek V4.1
  Flash）：遮蔽 200K→100K、整段摘要 400K
- 删除逐条存根、语义 worker、soft/hard/target 比例与自行取消 Pi 压缩的门控；
  Pi 原生阈值压缩保留为最终安全网

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

pi-compaction/test/config.test.ts

@@ -2,34 +2,82 @@ import test from "node:test";
 import assert from "node:assert/strict";
 import { DEFAULT_CONFIG, normalizeConfig } from "../src/config.ts";
 
-test("normalizes one greenfield piCompaction config without legacy aliases", () => {
+test("normalizes a full pi-compaction config", () => {
   const config = normalizeConfig({
     enabled: false,
-    softRatio: 0.7,
-    hardRatio: 0.91,
-    targetRatio: 0.5,
-    deterministic: { enabled: false, maxStubTokens: 512 },
-    semantic: { enabled: false, concurrency: 2, maxRetries: 0 },
+    masking: {
+      enabled: false,
+      triggerTokens: 150_000,
+      triggerRatio: 0.5,
+      targetTokens: 60_000,
+      targetRatio: 0.2,
+      minClearTokens: 30_000,
+      keepRecentTurns: 5,
+      minEntryTokens: 512,
+      excludeTools: ["bash", "read"],
+    },
+    summary: { triggerTokens: 300_000, triggerRatio: 0.8, thinking: "medium" },
     native: { enabled: false },
   });
   assert.equal(config.enabled, false);
-  assert.equal(config.deterministic.enabled, false);
-  assert.equal(config.deterministic.maxStubTokens, 512);
-  assert.equal(config.semantic.enabled, false);
-  assert.equal(config.semantic.maxRetries, 0);
+  assert.deepEqual(config.masking, {
+    enabled: false,
+    triggerTokens: 150_000,
+    triggerRatio: 0.5,
+    targetTokens: 60_000,
+    targetRatio: 0.2,
+    minClearTokens: 30_000,
+    keepRecentTurns: 5,
+    minEntryTokens: 512,
+    excludeTools: ["bash", "read"],
+  });
+  assert.equal(config.summary.triggerTokens, 300_000);
+  assert.equal(config.summary.triggerRatio, 0.8);
+  assert.equal(config.summary.thinking, "medium");
   assert.equal(config.native.enabled, false);
 });
 
-test("invalid ratios and bounds fail safe to bounded defaults", () => {
+test("invalid fields fail safe to bounded defaults", () => {
   const config = normalizeConfig({
-    softRatio: 2,
-    hardRatio: -1,
-    targetRatio: 0.99,
-    semantic: { concurrency: 50, maxRetries: -1 },
+    enabled: "yes",
+    masking: {
+      triggerTokens: -1,
+      triggerRatio: 2,
+      targetTokens: "a lot",
+      targetRatio: 0,
+      minClearTokens: 0,
+      keepRecentTurns: 500,
+      minEntryTokens: -3,
+      excludeTools: "read",
+    },
+    summary: { triggerTokens: Number.NaN, triggerRatio: 1.5, thinking: "insane" },
+    native: { enabled: 1 },
   });
-  assert.equal(config.softRatio, DEFAULT_CONFIG.softRatio);
-  assert.ok(config.targetRatio < config.softRatio);
-  assert.ok(config.hardRatio > config.softRatio);
-  assert.equal(config.semantic.concurrency, DEFAULT_CONFIG.semantic.concurrency);
-  assert.equal(config.semantic.maxRetries, DEFAULT_CONFIG.semantic.maxRetries);
+  assert.equal(config.enabled, DEFAULT_CONFIG.enabled);
+  assert.deepEqual(config.masking, DEFAULT_CONFIG.masking);
+  assert.equal(config.summary.triggerTokens, DEFAULT_CONFIG.summary.triggerTokens);
+  assert.equal(config.summary.triggerRatio, DEFAULT_CONFIG.summary.triggerRatio);
+  assert.equal(config.summary.thinking, DEFAULT_CONFIG.summary.thinking);
+  assert.equal(config.native.enabled, DEFAULT_CONFIG.native.enabled);
+});
+
+test("masking target is corrected below trigger and summary above masking", () => {
+  const config = normalizeConfig({
+    masking: { triggerTokens: 80_000, triggerRatio: 0.5, targetTokens: 120_000, targetRatio: 0.9 },
+    summary: { triggerTokens: 50_000, triggerRatio: 0.4 },
+  });
+  assert.equal(config.masking.targetTokens, 40_000);
+  assert.equal(config.masking.targetRatio, 0.25);
+  assert.equal(config.summary.triggerTokens, 160_000);
+  assert.ok(config.summary.triggerRatio > config.masking.triggerRatio);
+});
+
+test("minClearTokens and excludeTools accept valid overrides", () => {
+  const config = normalizeConfig({
+    masking: { minClearTokens: 1, keepRecentTurns: 1, minEntryTokens: 0, excludeTools: [] },
+  });
+  assert.equal(config.masking.minClearTokens, 1);
+  assert.equal(config.masking.keepRecentTurns, 1);
+  assert.equal(config.masking.minEntryTokens, 0);
+  assert.deepEqual(config.masking.excludeTools, []);
 });