feat: unify context compaction

pi-compaction/test/config.test.ts

@@ -0,0 +1,35 @@
+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", () => {
+  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 },
+    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.equal(config.native.enabled, false);
+});
+
+test("invalid ratios and bounds fail safe to bounded defaults", () => {
+  const config = normalizeConfig({
+    softRatio: 2,
+    hardRatio: -1,
+    targetRatio: 0.99,
+    semantic: { concurrency: 50, maxRetries: -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);
+});