rename crates/ to engrams/; add el-compiler el package with bootstrap artifact

- crates/ → engrams/ (Rust engrams live here)
- el-compiler/ added: el self-hosting compiler as an el package
  - src/{compiler,lexer,parser,codegen}.el
  - bootstrap/el-compiler.elc (114KB, Rust-compiled seed)
- el.toml Cargo.toml workspace paths updated
- neuron-rs cross-repo path deps fixed (were pointing to products/ instead of foundation/)

bin/el/Cargo.toml

@@ -39,3 +39,5 @@ softbuffer  = "0.3"
 tiny-skia   = "0.11"
 fontdue     = "0.8"
 image       = { workspace = true }
+tungstenite = { workspace = true }
+native-tls  = { workspace = true }