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

engram/engrams/engram-tx/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "engram-tx"
+version = "0.1.0"
+edition = "2021"
+description = "Command pattern + rollback-of-rollback transaction engine for Engram"
+license = "MIT"
+
+[dependencies]
+engram-core = { path = "../engram-core" }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+uuid = { version = "1", features = ["v4", "serde"] }
+thiserror = "1"
+sled = "0.34"
+
+[dev-dependencies]
+tempfile = "3"