fix(plan-tune): keep the 10-answer floor in --check-mismatch beside the per-dimension floor

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

bin/gstack-developer-profile

@@ -736,7 +736,7 @@ do_check_mismatch() {
     const sampleSize = (p.inferred && p.inferred.sample_size) || 0;
     const contributing = p.inferred && p.inferred.contributing_events;
 
-    if (!contributing && sampleSize < 10) {
+    if (sampleSize < 10) {
       console.log('MISMATCH: not enough data (' + sampleSize + ' events; need 10+)');
       process.exit(0);
     }

changelog.d/garrytan-gsta216-l4-mismatch-evidence.md

@@ -1,8 +1,8 @@
 **/plan-tune no longer reports a mismatch between your stated and observed preferences when it has no observed answers behind it (#3436).** `--check-mismatch` compared a declared value against an inferred value that had never moved from its 0.5 starting point, so a strong declaration with no matching answers printed `scope_appetite: declared 0.9 vs inferred 0.5 (gap 0.4)` even though no logged answer touched that dimension.
 
 ### Fixed
-- **`bin/gstack-developer-profile`**: `--check-mismatch`, `--gap` and the gap that `--derive` stores compare a dimension only when at least 3 logged answers moved it. For a profile with per-dimension counts, this floor replaces the old 10-answer overall minimum. Below it, `--check-mismatch` prints `no observed evidence` or `too little evidence (n of 3 events)` instead of a gap, and `--gap` lists the dimension under a new `low_evidence` field. A profile derived before `contributing_events` existed keeps the old behavior until its next derive.
+- **`bin/gstack-developer-profile`**: `--check-mismatch`, `--gap` and the gap that `--derive` stores compare a dimension only when at least 3 logged answers moved it. `--check-mismatch` still needs 10 logged answers overall before it reports anything. Below the 3-answer floor, `--check-mismatch` prints `no observed evidence` or `too little evidence (n of 3 events)` instead of a gap, and `--gap` lists the dimension under a new `low_evidence` field. A profile derived before `contributing_events` existed keeps the old behavior until its next derive.
 - **/plan-tune "Show gap"**: says "not enough observed answers yet" for those dimensions instead of calling them drift.
 
 ### Tests
-- `test/gstack-developer-profile.test.ts`: a declared dimension with no evidence is not flagged by `--check-mismatch` or `--gap` (both failed on main), 1 or 2 events report too little evidence, 3 events are compared, and `--derive` stores no gap without evidence.
+- `test/gstack-developer-profile.test.ts`: a declared dimension with no evidence is not flagged by `--check-mismatch` or `--gap` (both failed on main), 1 or 2 events report too little evidence, 3 events are compared, three same-day answers that agree with the declaration still report not enough data, and `--derive` stores no gap without evidence.

test/gstack-developer-profile.test.ts

@@ -657,7 +657,7 @@ describe('gstack-developer-profile --check-mismatch', () => {
     const p = readProfile() as any;
     p.declared = { scope_appetite: 0.9 };
     p.inferred.values.scope_appetite = 0.45;
-    p.inferred.sample_size = 2;
+    p.inferred.sample_size = 10;
     p.inferred.contributing_events = { scope_appetite: 2 };
     fs.writeFileSync(file, JSON.stringify(p));
     const r = runDev('--check-mismatch');
@@ -672,13 +672,28 @@ describe('gstack-developer-profile --check-mismatch', () => {
     const p = readProfile() as any;
     p.declared = { scope_appetite: 0.9 };
     p.inferred.values.scope_appetite = 0.45;
-    p.inferred.sample_size = 3;
+    p.inferred.sample_size = 10;
     p.inferred.contributing_events = { scope_appetite: 3 };
     fs.writeFileSync(file, JSON.stringify(p));
     expect(runDev('--check-mismatch').stdout).toContain('scope_appetite: declared 0.9 vs inferred 0.45 (gap 0.45)');
     expect(JSON.parse(runDev('--gap').stdout).gap.scope_appetite).toBeCloseTo(0.45, 2);
   });
 
+  test('three same-day answers that agree with the declaration are not a mismatch', () => {
+    for (let i = 0; i < 3; i++) {
+      logQuestion({ skill: 'plan-ceo-review', question_id: 'plan-ceo-review-mode', question_summary: 'mode?', user_choice: 'expand', session_id: `s${i}`, ts: '2026-10-20T12:00:00Z' });
+    }
+    expect(runDev('--derive').status).toBe(0);
+    const file = path.join(tmpHome, 'developer-profile.json');
+    const p = readProfile() as any;
+    expect(p.inferred.contributing_events.scope_appetite).toBe(3);
+    p.declared = { scope_appetite: 0.9 };
+    fs.writeFileSync(file, JSON.stringify(p));
+    const r = runDev('--check-mismatch');
+    expect(r.stdout).toContain('not enough data');
+    expect(r.stdout).not.toContain('scope_appetite: declared');
+  });
+
   test('derive stores the gap for a dimension with 3 contributing events', () => {
     for (let i = 0; i < 3; i++) {
       logQuestion({ skill: 'plan-eng-review', question_id: 'plan-eng-review-arch-finding', question_summary: 'arch?', user_choice: 'fix-now', session_id: `s${i}`, ts: `2026-10-2${i}T12:00:00Z` });