fix(audit-2): integration regressions + data-integrity from second-pass review

Two reviewer agents did a second-pass deep audit of the 21-commit
refactor. Eight findings; four fixed here (one was deferred with a
schema comment, three were 🟡 nice-to-haves left for follow-up).

Integration regressions (🟠 high):
- Outbound webhook `interest.berth_linked` now fires from the new
  junction-add handler. Was emitting a socket-only event, leaving
  external integrations silent post-refactor.
- Two new webhook events `interest.berth_unlinked` and
  `interest.berth_link_updated` added to WEBHOOK_EVENTS +
  INTERNAL_TO_WEBHOOK_MAP. PATCH and DELETE handlers now dispatch them
  alongside the existing socket emits — lifecycle parity restored.
- BerthInterestPulse adds useRealtimeInvalidation for berth-link
  events. The query key was berth-scoped while the linked-berths
  dialog invalidates interest-scoped keys (no prefix match), so the
  pulse went stale. Bridges via the realtime hook now.

Recommender semantic fix (🟠 medium-high):
- aggregates CTE: active_interest_count now filters on
  `ib.is_specific_interest = true`, matching the public-map "Under
  Offer" derivation. EOI-bundle-only links no longer demote a berth
  to Tier C for other reps. Smoke test confirms previously-all-Tier-C
  results now correctly classify as Tier A.
- Same CTE: `total_interest_count` uses COUNT(ib.berth_id) instead of
  COUNT(*) so a berth with no junction rows reports 0 (not 1 from
  the LEFT JOIN's NULL-right-side row). Prevents heat over-counting.

Data integrity (🟠):
- AcroForm tier rejects negative numerics in coerceFieldValue (was
  letting through `length_ft="-50"` which would poison the
  recommender feasibility filter on apply).
- FilesystemBackend.resolveHmacSecret throws in production when
  storage_proxy_hmac_secret_encrypted is null. Dev still derives from
  BETTER_AUTH_SECRET for ergonomics; prod must explicitly configure.
- Documented the circular FK between berths.current_pdf_version_id
  and berth_pdf_versions.id. Drizzle's `.references()` can't express
  the cycle so the schema column is plain text + a comment; the FK
  is authoritatively maintained by migration 0030.

Tests still 1163/1163. tsc clean.

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

src/lib/services/berth-pdf-parser.ts

@@ -470,9 +470,13 @@ function coerceFieldValue(key: keyof ExtractedBerthFields, raw: string): string
     }
     return raw;
   }
-  // Numeric columns: strip currency / unit suffixes and commas.
+  // Numeric columns: strip currency / unit suffixes and commas. Berth
+  // dimensions / capacities / prices are all non-negative — reject
+  // negatives outright so an AcroForm with `length_ft="-50"` doesn't
+  // poison the recommender feasibility filter when applied.
   const numeric = Number(raw.replace(/[^0-9.\-]/g, ''));
-  return Number.isFinite(numeric) ? numeric : null;
+  if (!Number.isFinite(numeric)) return null;
+  return numeric < 0 ? null : numeric;
 }
 
 /** Parse a human date like "September 15 2025" → "2025-09-15". */

src/lib/services/berth-recommender.service.ts

@@ -448,7 +448,15 @@ export async function recommendBerths(args: RecommendBerthsArgs): Promise<Recomm
     aggregates AS (
       SELECT
         f.id AS berth_id,
-        COUNT(*) FILTER (WHERE i.archived_at IS NULL AND i.outcome IS NULL) AS active_interest_count,
+        -- Active = is_specific_interest=true junction rows only (matches
+        -- the public-map "Under Offer" filter). An EOI-bundle-only link
+        -- (is_specific_interest=false, is_in_eoi_bundle=true) is legal
+        -- coverage, not a pitch, and shouldn't demote the berth.
+        COUNT(*) FILTER (
+          WHERE i.archived_at IS NULL
+            AND i.outcome IS NULL
+            AND ib.is_specific_interest = true
+        ) AS active_interest_count,
         COUNT(*) FILTER (
           WHERE i.outcome IS NOT NULL AND (i.outcome::text LIKE 'lost%' OR i.outcome = 'cancelled')
         ) AS lost_count,
@@ -483,7 +491,11 @@ export async function recommendBerths(args: RecommendBerthsArgs): Promise<Recomm
           ) FILTER (WHERE i.outcome IS NOT NULL AND (i.outcome::text LIKE 'lost%' OR i.outcome = 'cancelled')),
           0
         ) AS fallthrough_max_stage,
-        COUNT(*) AS total_interest_count,
+        -- COUNT(ib.berth_id) (not COUNT(*)) so a berth with no junction
+        -- rows reports 0 — the LEFT JOIN otherwise produces a single
+        -- NULL-right-side row that COUNT(*) would tally as 1 and inflate
+        -- the heat interest-count component for berths with no history.
+        COUNT(ib.berth_id) AS total_interest_count,
         COUNT(*) FILTER (WHERE i.eoi_status = 'signed') AS eoi_signed_count
       FROM feasible f
       LEFT JOIN interest_berths ib ON ib.berth_id = f.id

src/lib/services/webhook-event-map.ts

@@ -11,6 +11,8 @@ export const WEBHOOK_EVENTS = [
   'interest.created',
   'interest.stage_changed',
   'interest.berth_linked',
+  'interest.berth_unlinked',
+  'interest.berth_link_updated',
   'berth.status_changed',
   'berth.updated',
   'document.sent',
@@ -51,6 +53,8 @@ export const INTERNAL_TO_WEBHOOK_MAP: Record<string, WebhookEvent> = {
   'interest:created': 'interest.created',
   'interest:stageChanged': 'interest.stage_changed',
   'interest:berthLinked': 'interest.berth_linked',
+  'interest:berthUnlinked': 'interest.berth_unlinked',
+  'interest:berthLinkUpdated': 'interest.berth_link_updated',
   'berth:statusChanged': 'berth.status_changed',
   'berth:updated': 'berth.updated',
   'document:sent': 'document.sent',