fix: update test descriptions to be buffer-agnostic

Author: ethanndickson

src/browser/utils/compaction/autoCompactionCheck.test.ts

@@ -319,8 +319,8 @@ describe("checkAutoCompaction", () => {
       expect(result.shouldForceCompact).toBe(false);
     });
 
-    test("shouldForceCompact is true when remaining <= 4k buffer", () => {
-      // 200k - 196k = 4k remaining (exactly at buffer)
+    test("shouldForceCompact is true when remaining <= buffer", () => {
+      // Exactly at buffer threshold
       const liveUsage = createUsageEntry(SONNET_MAX_TOKENS - BUFFER);
       const usage = createMockUsage(50_000, undefined, KNOWN_MODELS.SONNET.id, liveUsage);
       const result = checkAutoCompaction(usage, KNOWN_MODELS.SONNET.id, false, true);
@@ -336,8 +336,8 @@ describe("checkAutoCompaction", () => {
       expect(result.shouldForceCompact).toBe(true);
     });
 
-    test("shouldForceCompact is false when just above 4k buffer", () => {
-      // 200k - 195999 = 4001 remaining (just above buffer)
+    test("shouldForceCompact is false when just above buffer", () => {
+      // 1 token above buffer threshold
       const liveUsage = createUsageEntry(SONNET_MAX_TOKENS - BUFFER - 1);
       const usage = createMockUsage(50_000, undefined, KNOWN_MODELS.SONNET.id, liveUsage);
       const result = checkAutoCompaction(usage, KNOWN_MODELS.SONNET.id, false, true);
@@ -346,7 +346,7 @@ describe("checkAutoCompaction", () => {
     });
 
     test("shouldForceCompact respects 1M context mode", () => {
-      // With 1M context, 996k tokens = 4k remaining (should trigger)
+      // With 1M context, exactly at buffer threshold
       const liveUsage = createUsageEntry(1_000_000 - BUFFER);
       const usage = createMockUsage(50_000, undefined, KNOWN_MODELS.SONNET.id, liveUsage);
       const result = checkAutoCompaction(usage, KNOWN_MODELS.SONNET.id, true, true);