fix(#57+#58+#59): canonical-resolve compare-card marketplace lookup

One root cause, three symptoms on the HDFC ERGO Optima Restore compare
card. page.tsx policyById was keyed ONLY by exact marketplace policy_id;
the compare modal resolves the marketplace row by the CITED policy_id. A
recommendation can cite a doctype/variant/alias id that is not byte-equal
to the marketplace card's id (same canonical-identity class #40 solved
for grades) → policyById[id] undefined → the card silently degraded:
- #58 no network_list_url → 'Hospitals list' link missing
- #57 no rationalised SI → Cover amount fell back to 'As per policy schedule'
- #59 fewer populated fields → shorter/asymmetric vs Niva Bupa & Star

Fix: build a canonical-resolving index (exact policy_id wins, plus
doctype-stripped product_key + normalised policy_name + aliases, never
overwriting a real id hit) and a _resolvePolicy(id,name) fallback chain;
PolicyCompareModal now passes c.policy_name as the canonical fallback.
Niva Bupa & Star already matched exactly so they were unaffected; HDFC
now resolves to its real marketplace card (link + SI + full fields).

tsc --noEmit clean; frontend build Compiled successfully.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/app/page.tsx

@@ -3877,14 +3877,44 @@ function CitedPolicyCards({
   // same 4-stat grid + highlights that the marketplace cards show. When the
   // marketplace hasn't loaded yet (or a cited policy isn't in the corpus),
   // the modal's PolicyHighlights section silently skips.
+  // Canonical-resolving index (#57/#58/#59 root cause): the compare modal
+  // looks up the marketplace row by the CITED policy_id. A recommendation
+  // can cite a doctype/variant/alias id that is not byte-equal to the
+  // marketplace card's policy_id (same canonical-identity class #40 solved
+  // for grades). An exact-only map then returns undefined → the card loses
+  // its Hospitals link, SI falls back to "As per policy schedule", and it
+  // renders fewer fields (asymmetric). So we also register weaker canonical
+  // keys: the doctype-stripped product_key, the normalised policy_name, and
+  // every alias name — without ever overwriting a real exact-id hit.
+  const _DOCT_RE = /__(wordings|brochure|cis|prospectus)$/;
+  const _pkOf = (s: string) => (s || "").replace(_DOCT_RE, "");
+  const _nmKey = (s: string) =>
+    "nm:" + (s || "").trim().toLowerCase().replace(/\s+/g, " ");
   const policyById: Record<string, MarketplacePolicy> = (() => {
     const out: Record<string, MarketplacePolicy> = {};
     if (!marketplace) return out;
+    // Pass 1 — exact policy_id is the strongest key; set first.
+    for (const p of marketplace.policies) out[p.policy_id] = p;
+    // Pass 2 — weaker canonical keys, only when not already a real id hit.
     for (const p of marketplace.policies) {
-      out[p.policy_id] = p;
+      const k = _pkOf(p.policy_id);
+      if (k && !(k in out)) out[k] = p;
+      const nk = _nmKey(p.policy_name);
+      if (nk !== "nm:" && !(nk in out)) out[nk] = p;
+      for (const a of p.aliases ?? []) {
+        const ak = _nmKey(a);
+        if (ak !== "nm:" && !(ak in out)) out[ak] = p;
+      }
     }
     return out;
   })();
+  const _resolvePolicy = (
+    id: string,
+    name?: string,
+  ): MarketplacePolicy | undefined =>
+    policyById[id] ??
+    policyById[_pkOf(id)] ??
+    (name ? policyById[_nmKey(name)] : undefined);
 
   // Translate the live UserProfile (chat-side) into the shapes the
   // premium-bulk and scorecard-bulk endpoints expect. These two shapes are
@@ -4040,7 +4070,7 @@ function CitedPolicyCards({
           policies={topPolicies}
           onClose={() => setCompareOpen(false)}
           profile={profile}
-          policyDataFor={(id) => policyById[id]}
+          policyDataFor={(id, name) => _resolvePolicy(id, name)}
           renderPremiumFor={(policyId, policyName) => (
             <PolicyPremiumWidget
               policyId={policyId}

frontend/src/components/PolicyCompareModal.tsx

@@ -241,7 +241,15 @@ export type PolicyCompareModalProps = {
   // Optional resolver returning the marketplace MarketplacePolicy row for a
   // citation. Powers the new "POLICY HIGHLIGHTS" section (4-stat grid +
   // bullets). When undefined, the highlights section is skipped.
-  policyDataFor?: (policyId: string) => MarketplacePolicy | undefined;
+  // Resolve by cited policy_id; policyName is a canonical fallback so a
+  // doctype/variant/alias id (e.g. recommended `hdfc-ergo__optima-restore`
+  // vs marketplace card `..__brochure`) still resolves to its card —
+  // otherwise the card silently degrades (no Hospitals link, SI falls back
+  // to "As per policy schedule", fewer fields → asymmetric). #57/#58/#59.
+  policyDataFor?: (
+    policyId: string,
+    policyName?: string,
+  ) => MarketplacePolicy | undefined;
   // Hook for "Open in full marketplace" — defaults to no-op + closes modal.
   onOpenMarketplace?: () => void;
 };
@@ -428,7 +436,7 @@ export default function PolicyCompareModal({
                     c.policy_id,
                     c.policy_name,
                   )}
-                  marketplacePolicy={policyDataFor?.(c.policy_id)}
+                  marketplacePolicy={policyDataFor?.(c.policy_id, c.policy_name)}
                   profile={_profile as SnapProfile}
                 />
               </div>