fix(compare): expert sign-off must-fixes — phase-matched admissions, Ofsted sentinel codes, selective-school copy

M1: admissions rounds are now selected by the active phase tab
(admissionsForPhase) — an all-through school's Year 7 round no longer
masquerades as Reception odds beside pure primaries; honest per-cell and
section fallbacks name the round (Reception / Year 7).
M2: Ofsted sentinel codes (9 = not applicable) never render as judgement
chips, and the sixth-form judgement — previously dropped — now renders
for schools that have one.
M3: 'What this means' is phase- and type-aware: selective schools get
entrance-test framing, secondary faith schools a faith-criteria note, and
the primaries' distance template never appears on the secondary tab
(admissions_policy now exposed in compare school_info).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB

nextjs-app/__tests__/lib/compareLogic.test.ts

@@ -7,6 +7,7 @@
 
 import {
   OFSTED_LEGACY_GRADES,
+  admissionsForPhase,
   ofstedDisplay,
   progressBand,
   rcAreaLabel,
@@ -188,6 +189,44 @@ describe('summariseAdmissions', () => {
   });
 });
 
+describe('admissionsForPhase', () => {
+  const row = (year: number, school_phase: string | null): SchoolAdmissions =>
+    ({ year, school_phase, places_offered: 100, total_applications: 200, first_preference_offer_pct: 80 }) as SchoolAdmissions;
+
+  it('returns the latest round matching the active phase', () => {
+    const data = {
+      admissions: row(202627, 'Secondary'),
+      admissions_history: [row(202526, 'Secondary'), row(202526, 'Primary'), row(202425, 'Primary')],
+    };
+    expect(admissionsForPhase(data, true)?.year).toBe(202627);
+    expect(admissionsForPhase(data, false)?.year).toBe(202526);
+    expect(admissionsForPhase(data, false)?.school_phase).toBe('Primary');
+  });
+
+  it("never substitutes the other phase's round (all-through with Year 7 data only)", () => {
+    const data = {
+      admissions: row(202627, 'Secondary'),
+      admissions_history: [row(202526, 'Secondary')],
+    };
+    expect(admissionsForPhase(data, false)).toBeNull();
+    expect(admissionsForPhase(data, true)?.year).toBe(202627);
+  });
+
+  it('uses untagged legacy rows only when no row carries a phase', () => {
+    const untagged = { admissions: row(202627, null), admissions_history: [row(202526, null)] };
+    expect(admissionsForPhase(untagged, false)?.year).toBe(202627);
+    expect(admissionsForPhase(untagged, true)?.year).toBe(202627);
+
+    const mixed = { admissions: row(202627, 'Secondary'), admissions_history: [row(202526, null)] };
+    expect(admissionsForPhase(mixed, false)).toBeNull();
+  });
+
+  it('handles missing data', () => {
+    expect(admissionsForPhase(null, false)).toBeNull();
+    expect(admissionsForPhase({ admissions: null, admissions_history: [] }, true)).toBeNull();
+  });
+});
+
 describe('progressBand', () => {
   it('CI entirely above zero → above', () => {
     expect(progressBand(1.2, 0.4, 2.0)).toBe('above');