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/embeddings/candle-wasm/Cargo.toml

@@ -0,0 +1,55 @@
+[package]
+name = "candle-embeddings"
+version = "0.1.0"
+edition = "2021"
+description = "WASM-based sentence embeddings using Candle and all-MiniLM-L6-v2"
+license = "MIT"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+# Candle ML framework
+candle-core = "0.8"
+candle-nn = "0.8"
+candle-transformers = "0.8"
+
+# HuggingFace tokenizer with WASM support
+# Use unstable_wasm feature which provides fancy-regex instead of onig
+tokenizers = { version = "0.20", default-features = false, features = ["unstable_wasm"] }
+
+# WASM bindings
+wasm-bindgen = "0.2"
+wasm-bindgen-futures = "0.4"
+js-sys = "0.3"
+web-sys = { version = "0.3", features = ["console"] }
+
+# Serialization for model loading
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+
+# Error handling
+anyhow = "1.0"
+
+# Async
+futures = "0.3"
+
+# WASM compatibility - force getrandom with js/wasm_js features
+# getrandom 0.2 (from tokenizers->rand) needs "js" feature
+# getrandom 0.3 (from candle->rand 0.9) needs "wasm_js" feature + rustflags
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+getrandom_02 = { package = "getrandom", version = "0.2", features = ["js"] }
+getrandom = { version = "0.3", features = ["wasm_js"] }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3"
+
+[profile.release]
+opt-level = "z"     # Optimize for size
+lto = true          # Link-time optimization
+codegen-units = 1   # Single codegen unit for better optimization
+panic = "abort"     # Abort on panic (smaller binary)
+
+[features]
+default = []
+simd = []  # Enable SIMD when browser support is available