feat(domain): F004 – expand domain model layer

- need.ts: add SizeRange, MustHaveCriterion, WeightedPreference types; extend Need with desiredLocation, sizeRange, mustHaveCriteria, weightedPreferences, status
- futureSignal.ts: add SignalEvidence type; extend FutureSignal with title, evidence, matchabilityScore, reviewStatus
- aiOutput.ts: new AIOutput entity with type, inputHash, outputJson, provider/model/promptVersion/schemaVersion, reviewStatus
- activityEvent.ts: new ActivityEvent entity with actorId, action, entityType, entityId, timestamp, metadata
- unifiedResult.ts: discriminated union (VerifiedPortfolioResult | ExternalMarketResult | FutureAvailabilityResult)
- index.ts: export all three new files
- Properties.tsx: add LIGHT_INDUSTRIAL + UNKNOWN cases to exhaustive switches

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/domain/need.ts

@@ -1,4 +1,4 @@
-import type { AssetType } from './enums'
+import type { AssetType, MatchStatus } from './enums'
 
 export interface AreaRange {
   min: number
@@ -40,17 +40,43 @@ export interface SoftFactorPreferences {
   requireHighVisibility?: boolean
 }
 
+export interface SizeRange {
+  minSqm: number
+  maxSqm: number
+}
+
+export interface MustHaveCriterion {
+  criterion: string
+  description?: string
+  weight?: number  // 0–1, how much a miss hurts the score
+}
+
+export interface WeightedPreference {
+  criterion: string
+  weight: number   // 0–1
+  idealValue?: string | number
+  description?: string
+}
+
 export interface Need {
   id: string
   companyName: string
   contactName?: string
   assetType: AssetType
   requiredArea: AreaRange
+
+  // F004 additions
+  desiredLocation?: string[]           // preferred city/district list
+  sizeRange?: SizeRange                // structured alias for requiredArea
+  mustHaveCriteria?: MustHaveCriterion[]
+  weightedPreferences?: WeightedPreference[]
+  status?: MatchStatus | 'ACTIVE' | 'INACTIVE' | 'DRAFT' | 'CLOSED'
+
   preferredLocations: string[]
   excludedLocations?: string[]
   budgetRange: BudgetRange
   timing: Timing
-  mustCriteriaText?: string[]
+  mustCriteriaText?: string[]          // legacy — prefer mustHaveCriteria
   softFactors?: SoftFactorPreferences
   weightingProfile: WeightingProfile
   confidenceInCriteria: number