rename crates/ to engrams/, bindings/ to receptors/

- crates/ → engrams/ (Rust engrams live here)
- bindings/ → receptors/ (cross-language access points into the graph)
- Cargo.toml workspace paths updated

engrams/engram-projection/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "engram-projection"
+version = "0.1.0"
+edition = "2021"
+description = "Schema/projection layer for Engram — schema-free views over the activation surface"
+license = "MIT"
+
+[dependencies]
+engram-core = { path = "../engram-core" }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+uuid = { version = "1", features = ["v4", "serde"] }
+thiserror = "1"
+base64 = "0.22"
+
+[dev-dependencies]
+tempfile = "3"