chore: Raise TIER2_MAX_LINES threshold from 150 to 250

.github/scripts/__tests__/pr-triage-classify.test.js

@@ -373,9 +373,17 @@ describe('determineTier', () => {
       assert.equal(classify('alice', 'claude/small-multi', files), 2);
     });
 
-    it('human branch at 149 prod lines (just under threshold)', () => {
+    it('human branch at 249 prod lines (just under threshold)', () => {
       assert.equal(classify('alice', 'fix/component', [
-        makeFile('packages/app/src/Foo.tsx', 100, 49),  // 149 lines
+        makeFile('packages/app/src/Foo.tsx', 200, 49),  // 249 lines
+      ]), 2);
+    });
+
+    it('focused new UI component at 238 prod lines qualifies for Tier 2 (PR #2175 pattern)', () => {
+      assert.equal(classify('mikeshi', 'cursor/add-feedback-widget', [
+        makeFile('packages/app/src/components/AppNav/AppNavFeedback.tsx', 217, 0),
+        makeFile('packages/app/src/components/AppNav/AppNav.module.scss', 17, 0),
+        makeFile('packages/app/src/components/AppNav/AppNav.tsx', 4, 0),
       ]), 2);
     });
 
@@ -438,13 +446,13 @@ describe('determineTier', () => {
         makeFile('packages/api/src/services/checkAlerts.ts', 180, 70),       // prod: 250 lines
         makeFile('packages/api/src/__tests__/checkAlerts.test.ts', 1100, 0), // test: excluded
       ];
-      // 250 prod lines > TIER2_MAX_LINES (150) → Tier 3, not Tier 4
+      // 250 prod lines >= TIER2_MAX_LINES (250) → Tier 3, not Tier 4
       assert.equal(classify('alice', 'feat/alert-thresholds', files), 3);
     });
 
-    it('human branch at exactly 150 prod lines is Tier 3, not Tier 2', () => {
+    it('human branch at exactly 250 prod lines is Tier 3, not Tier 2', () => {
       assert.equal(classify('alice', 'fix/component', [
-        makeFile('packages/app/src/Foo.tsx', 100, 50),  // exactly TIER2_MAX_LINES — < is exclusive
+        makeFile('packages/app/src/Foo.tsx', 150, 100),  // exactly TIER2_MAX_LINES — < is exclusive
       ]), 3);
     });
 
@@ -562,6 +570,13 @@ describe('buildTierComment', () => {
     assert.ok(body.includes('Standard feature/fix'));
   });
 
+  it('explains line count trigger when prod lines exceed Tier 2 threshold', () => {
+    const body = buildTierComment(3, makeSignals({ prodLines: 260 }));
+    assert.ok(body.includes('260'));
+    assert.ok(body.includes('Diff size'));
+    assert.ok(!body.includes('Standard feature/fix'));
+  });
+
   it('includes bot-author trigger for Tier 1 bot PRs', () => {
     const body = buildTierComment(1, makeSignals({ isBotAuthor: true, author: 'dependabot[bot]' }));
     assert.ok(body.includes('Bot author'));

.github/scripts/pr-triage-classify.js

@@ -36,7 +36,7 @@ const TEST_FILE_PATTERNS = [
 ];
 
 // ── Thresholds (all line counts exclude test and trivial files) ───────────────
-const TIER2_MAX_LINES = 150;           // max prod lines eligible for Tier 2
+const TIER2_MAX_LINES = 250;           // max prod lines eligible for Tier 2
 const TIER4_ESCALATION_HUMAN = 1000;   // Tier 3 → 4 for human branches
 const TIER4_ESCALATION_AGENT = 400;    // Tier 3 → 4 for agent branches (stricter)
 
@@ -191,6 +191,9 @@ function buildTierComment(tier, signals) {
   if (tier === 4 && prodLines > sizeThreshold && criticalFiles.length === 0) {
     triggers.push(`**Large diff**: ${prodLines} production lines changed (threshold: ${sizeThreshold})`);
   }
+  if (tier === 3 && prodLines >= TIER2_MAX_LINES) {
+    triggers.push(`**Diff size**: ${prodLines} production lines changed (Tier 2 max: < ${TIER2_MAX_LINES})`);
+  }
   if (isBotAuthor) triggers.push(`**Bot author**: \`${author}\``);
   if (allFilesTrivial && !isBotAuthor) triggers.push('**All files are docs / images / lock files**');
   if (isCrossLayer) {