feat: el-ide — native IDE for engram-lang, LSP, type graph, plugin ecosystem

Axum HTTP server (port 7771) serving a single-page IDE with CodeMirror 6
syntax highlighting for engram-lang, a force-directed type graph visualizer,
LSP (completions, hover, diagnostics), SSE-streamed build/run output, a
plugin host with five first-party plugins, and a reasoning panel that proxies
to engram-server. 28 tests across three crates, zero warnings.

crates/el-ide-server/Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "el-ide-server"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "el-ide"
+path = "src/main.rs"
+
+[dependencies]
+el-lsp         = { workspace = true }
+el-plugin-host = { workspace = true }
+
+serde       = { workspace = true }
+serde_json  = { workspace = true }
+thiserror   = { workspace = true }
+tokio       = { workspace = true }
+axum        = { workspace = true }
+tower-http  = { workspace = true }
+rust-embed  = { workspace = true }
+tracing             = { workspace = true }
+tracing-subscriber  = { workspace = true }
+reqwest             = { workspace = true }
+async-stream        = { workspace = true }
+tokio-stream        = { workspace = true }
+which               = { workspace = true }
+urlencoding         = "2"
+mime_guess          = { workspace = true }
+
+[dev-dependencies]
+tokio       = { workspace = true, features = ["macros", "rt"] }
+tower       = "0.5"