fix cross-repo path deps; remove el compiler from neuron-lang/

- neuron-runtime, neuron-store, neuron-migrate: fix path deps
  (products/engram/ → foundation/engram/engrams/, products/el/ → foundation/el/engrams/)
- neuron-rs workspace: fix axon-events/axon-protocol paths
  (../../../platform/ → ../../platform/, paths were off by one level)
- neuron-lang/compiler/ removed (el self-hosting compiler now lives in foundation/el/el-compiler/)

crates/neuron-runtime/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "neuron-runtime"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+# el crates (path deps)
+el-compiler  = { path = "../../../../foundation/el/engrams/el-compiler" }
+
+# engram core (for EngramDb type)
+engram-core  = { path = "../../../../foundation/engram/engrams/engram-core" }
+
+# neuron-rs workspace crates
+neuron-domain = { path = "../neuron-domain" }
+neuron-store  = { path = "../neuron-store" }
+axon-events   = { workspace = true }
+
+serde      = { workspace = true }
+serde_json = { workspace = true }
+uuid       = { workspace = true }
+chrono     = { workspace = true }
+tokio      = { workspace = true }
+tracing    = { workspace = true }
+thiserror  = { workspace = true }
+anyhow     = { workspace = true }
+ureq       = { version = "2", features = ["json"] }
+crossterm  = "0.28"
+
+[dev-dependencies]
+tempfile = "3"