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

backend/app.py

@@ -740,6 +740,9 @@ async def compare_schools(
                     "religious_denomination": convert_to_native(latest.get("religious_denomination")),
                     "age_range": convert_to_native(latest.get("age_range")),
                     "gender": convert_to_native(latest.get("gender")),
+                    # Needed by the admissions "What this means" copy: selective
+                    # schools get entrance-test framing, never the distance template.
+                    "admissions_policy": convert_to_native(latest.get("admissions_policy")),
                     "has_sixth_form": convert_to_native(latest.get("has_sixth_form")),
                     "capacity": convert_to_native(latest.get("capacity")),
                     "gias_total_pupils": convert_to_native(latest.get("gias_total_pupils")),