feat: migrate embeddings to Candle WASM + remove semantic type inference

Major architectural changes:

1. EMBEDDINGS ENGINE (ONNX → Candle WASM):
   - Replace ONNX Runtime with Rust Candle compiled to WASM
   - Embedded model in WASM binary (no external downloads)
   - Quantized Q8 precision with <50MB memory footprint
   - Zero-download, offline-first operation
   - Same embedding quality (all-MiniLM-L6-v2)

2. REMOVE SEMANTIC TYPE INFERENCE:
   - Delete embeddedKeywordEmbeddings.ts (14MB of pre-computed embeddings)
   - Remove typeAwareQueryPlanner.ts and semanticTypeInference.ts
   - Remove VerbExactMatchSignal (uses keyword embeddings)
   - Update SmartRelationshipExtractor to 3 signals (55%/30%/15% weights)

API CHANGES (requires v7.0.0):
- Removed: inferTypes(), inferNouns(), inferVerbs(), inferIntent()
- Removed: getSemanticTypeInference(), SemanticTypeInference class
- Removed: TypeInference, SemanticTypeInferenceOptions types

Users can still use natural language queries in find() - they just
need to specify type explicitly for type-optimized searches.

PACKAGE SIZE IMPACT:
- Compressed: 90.1 MB → 86.2 MB (-4.3%)
- Uncompressed: 114.4 MB → 100.3 MB (-12%)
- ~448K lines of code removed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/brainy.ts

@@ -1600,31 +1600,6 @@ export class Brainy<T = any> implements BrainyInterface<T> {
     const params: FindParams<T> =
       typeof query === 'string' ? await this.parseNaturalQuery(query) : query
 
-    // Phase 3: Automatic type inference for 40% latency reduction
-    if (params.query && !params.type && this.index instanceof TypeAwareHNSWIndex) {
-      // Import Phase 3 components dynamically
-      const { getQueryPlanner } = await import('./query/typeAwareQueryPlanner.js')
-      const planner = getQueryPlanner()
-      const plan = await planner.planQuery(params.query)
-
-      // Use inferred types if confidence is sufficient
-      if (plan.confidence > 0.6) {
-        params.type = plan.targetTypes.length === 1
-          ? plan.targetTypes[0]
-          : plan.targetTypes
-
-        // Log for analytics (production-friendly)
-        if (this.config.verbose) {
-          console.log(
-            `[Phase 3] Inferred types: ${plan.routing} ` +
-            `(${plan.targetTypes.length} types, ` +
-            `${(plan.confidence * 100).toFixed(0)}% confidence, ` +
-            `${plan.estimatedSpeedup.toFixed(1)}x estimated speedup)`
-          )
-        }
-      }
-    }
-
     // Zero-config validation - only enforces universal truths
     const { validateFindParams, recordQueryPerformance } = await import('./utils/paramValidation.js')
     validateFindParams(params)