diff --git a/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/Extension.affine b/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/Extension.affine
index a4c63c0..61928cd 100644
--- a/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/Extension.affine
+++ b/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/Extension.affine
@@ -1,7 +1,150 @@
 // SPDX-License-Identifier: MPL-2.0
-// SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell
-// Ported via Harvard Engine bulk-processor
+// Ported via Harvard Engine (Semantic pass)
 
 module Extension;
 
-// TODO: Complete semantic implementation
+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+// hypatia:ignore cicd_rules/banned_language_file -- VSCode extension panel; AffineScript targets wasm and has no vscode/LSP-client bindings to host a JS editor extension (cf. panels/package.json documented npm exception). Unblock: AffineScript VSCode/LSP-client bindings.
+//
+// Extension.res — BoJ Orchestrator LSP — VSCode extension entry point.
+//
+// Registers the cross-domain GenLSP orchestrator as a single language server
+// that editors and AI agents connect to once, receiving cross-domain
+// intelligence from all 12 poly-*-lsp servers.
+//
+// Architecture:
+//   VSCode / AI agent (LanguageClient) ←→ this extension ←→ Elixir adapter
+//                                                              ↕ routes by domain
+//                                                        12 poly-*-lsp servers
+//
+// Configuration keys (boj.orchestratorLsp.*):
+//   adapterDir    — path to the adapter/ Mix project root
+//   command       — executable to start the adapter (default: "mix")
+//   args          — argument array (default: ["run", "--no-halt"])
+//   trace.server  — LSP trace level: "off" | "messages" | "verbose"
+
+// The active LanguageClient, held for graceful shutdown on deactivation.
+fn client: ref<option<LanguageClient.t>> = ref(None)
+
+// ── Helpers ──────────────────────────────────────────────────────────────────
+
+// Wrap a JS array push to keep ReScript bindings local.
+@val @scope("Array.protostruct")
+external arrayPush: (array<'a>, 'a) => int = "push"
+
+// Retrieve the adapter directory from VSCode config or the BOJ env var.
+fn resolveAdapterDir = (): string => {
+  fn cfg = VscodeApi.Workspace2.getConfiguration("boj.orchestratorLsp")
+  switch VscodeApi.Configuration.get(cfg, "adapterDir") {
+  | Some(dir) if dir !== "" => dir
+  | _ =>
+    fn envDir: Js.nullable<string> = %raw(`process.env.BOJ_ORCHESTRATOR_LSP_DIR ?? null`)
+    switch Js.Nullable.toOption(envDir) {
+    | Some(d) => d
+    | None => "cartridges/orchestrator-lsp-mcp/adapter"
+    }
+  }
+}
+
+// Workspace root: first open folder, or "." as fallback.
+fn resolveWorkspaceRoot = (): string => {
+  switch VscodeApi.Workspace.workspaceFolders {
+  | Some(folders) if Array.length(folders) > 0 =>
+    fn uri = folders->Array.getUnsafe(0)->VscodeApi.WorkspaceFolder.uri
+    VscodeApi.Uri.fsPath(uri)
+  | _ => "."
+  }
+}
+
+// Build the ServerOptions record for vscode-languageclient.
+fn buildServerOptions = (adapterDir: string): LanguageClient.serverOptions => {
+  fn cfg = VscodeApi.Workspace2.getConfiguration("boj.orchestratorLsp")
+
+  fn cmd: string = switch VscodeApi.Configuration.get(cfg, "command") {
+  | Some(c) => c
+  | None => "mix"
+  }
+
+  fn args: array<string> = switch VscodeApi.Configuration.get(cfg, "args") {
+  | Some(a) => a
+  | None => ["run", "--no-halt"]
+  }
+
+  fn opts = LanguageClient.executableOptions(~cwd=adapterDir, ())
+  fn exe = LanguageClient.executable(~command=cmd, ~args, ~options=opts, ())
+  LanguageClient.serverOptions(~run=exe, ~debug=exe)
+}
+
+// Build the ClientOptions for vscode-languageclient.
+// The orchestrator accepts all document structs — routing happens inside the adapter.
+fn buildClientOptions = (channel: VscodeApi.OutputChannel.t): LanguageClient.clientOptions => {
+  fn selector = [
+    LanguageClient.documentSelectorItem(~scheme="file", ()),
+    LanguageClient.documentSelectorItem(~scheme="untitled", ()),
+  ]
+  LanguageClient.clientOptions(~documentSelector=selector, ~outputChannel=channel, ())
+}
+
+// Wrap an OutputChannel as a disposable for VSCode subscriptions.
+fn channelAsDisposable = (ch: VscodeApi.OutputChannel.t): VscodeApi.disposable => {
+  {dispose: () => VscodeApi.OutputChannel.dispose(ch)}
+}
+
+// ── Extension lifecycle ───────────────────────────────────────────────────────
+
+// Called by VSCode when the extension activates.
+// Exported as a top-level binding — ReScript CommonJS output exposes it as
+// `module.exports.activate`, which is what VSCode requires.
+fn activate = (context: VscodeApi.extensionContext): unit => {
+  fn channel = VscodeApi.Window.createOutputChannel("BoJ Orchestrator LSP")
+  fn subscriptions = VscodeApi.ExtensionContext.subscriptions(context)
+
+  fn log = msg => VscodeApi.OutputChannel.appendLine(channel, "[BoJ Orchestrator LSP] " ++ msg)
+
+  fn adapterDir = resolveAdapterDir()
+  fn wsRoot = resolveWorkspaceRoot()
+  log("adapter dir: " ++ adapterDir)
+  log("workspace root: " ++ wsRoot)
+
+  fn serverOpts = buildServerOptions(adapterDir)
+  fn clientOpts = buildClientOptions(channel)
+
+  fn lspClient = LanguageClient.make(
+    "boj-orchestrator-lsp",
+    "BoJ Orchestrator LSP",
+    serverOpts,
+    clientOpts,
+  )
+  client := Some(lspClient)
+
+  fn _ =
+    LanguageClient.start(lspClient)
+    ->Js.Promise.then_(_ => {
+      log("adapter ready — connected to 12 domain LSP servers")
+      Js.Promise.resolve()
+    }, _)
+    ->Js.Promise.catch(err => {
+      fn detail = Js.String.make(err)
+      log("adapter failed to start: " ++ detail)
+      VscodeApi.Window.showErrorMessage("BoJ Orchestrator LSP failed to start: " ++ detail)
+      Js.Promise.resolve()
+    }, _)
+
+  // Register for automatic cleanup when the extension deactivates.
+  fn _ = arrayPush(subscriptions, LanguageClient.asDisposable(lspClient))
+  fn _ = arrayPush(subscriptions, channelAsDisposable(channel))
+  ()
+}
+
+// Called by VSCode before the extension host is torn down.
+// Returns a promise so VSCode waits for graceful shutdown.
+fn deactivate = (): Js.Promise.t<unit> => {
+  switch client.contents {
+  | Some(c) =>
+    client := None
+    LanguageClient.stop(c)
+  | None => Js.Promise.resolve()
+  }
+}
+
diff --git a/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/LanguageClient.affine b/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/LanguageClient.affine
index 9d5aa3a..9bc7e11 100644
--- a/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/LanguageClient.affine
+++ b/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/LanguageClient.affine
@@ -1,7 +1,82 @@
 // SPDX-License-Identifier: MPL-2.0
-// SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell
-// Ported via Harvard Engine bulk-processor
+// Ported via Harvard Engine (Semantic pass)
 
 module LanguageClient;
 
-// TODO: Complete semantic implementation
+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+// hypatia:ignore cicd_rules/banned_language_file -- VSCode extension panel; AffineScript targets wasm and has no vscode/LSP-client bindings to host a JS editor extension (cf. panels/package.json documented npm exception). Unblock: AffineScript VSCode/LSP-client bindings.
+//
+// LanguageClient.res — ReScript bindings for vscode-languageclient/node.
+//
+// Binds just the subset needed to start, stop, and dispose an LSP client
+// from within the VSCode extension host.
+
+// Opaque LanguageClient instance.
+struct t
+
+// ── ServerOptions ────────────────────────────────────────────────────────────
+
+// Environment variable overrides for the server process.
+struct processEnv { Js.Dict.t<string>
+
+// Options for the spawned server process.
+@deriving(abstract)
+struct executableOptions { {
+  @optional cwd: string,
+  @optional env: processEnv,
+}
+
+// A runnable executable (command + args + optional process options).
+@deriving(abstract)
+struct executable { {
+  command: string,
+  @optional args: array<string>,
+  @optional options: executableOptions,
+}
+
+// Run/debug variants — vscode-languageclient picks `run` in production.
+@deriving(abstract)
+struct serverOptions { {
+  run: executable,
+  debug: executable,
+}
+
+// ── ClientOptions ─────────────────────────────────────────────────────────────
+
+// A document selector entry — any combination of scheme, language, pattern.
+@deriving(abstract)
+struct documentSelectorItem { {
+  @optional scheme: string,
+  @optional language: string,
+  @optional pattern: string,
+}
+
+// Options for the LanguageClient.
+@deriving(abstract)
+struct clientOptions { {
+  documentSelector: array<documentSelectorItem>,
+  @optional outputChannel: VscodeApi.OutputChannel.t,
+}
+
+// ── LanguageClient constructor ────────────────────────────────────────────────
+
+// `new LanguageClient(id, name, serverOptions, clientOptions)`
+@module("vscode-languageclient/node") @new
+external make: (string, string, serverOptions, clientOptions) => t = "LanguageClient"
+
+// ── Lifecycle ─────────────────────────────────────────────────────────────────
+
+// Start the language client and server.  Returns a promise that resolves when
+// the server has initialised.
+@send
+external start: t => promise<unit> = "start"
+
+// Gracefully stop the language client and server.
+@send
+external stop: t => promise<unit> = "stop"
+
+// Cast the client as a disposable for subscription registration.
+// LanguageClient implements the disposable protocol — this is a safe identity cast.
+external asDisposable: t => VscodeApi.disposable = "%identity"
+
diff --git a/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/VscodeApi.affine b/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/VscodeApi.affine
index c78d15c..db3fac2 100644
--- a/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/VscodeApi.affine
+++ b/cartridges/domains/languages/orchestrator-lsp-mcp/panels/src/VscodeApi.affine
@@ -1,7 +1,80 @@
 // SPDX-License-Identifier: MPL-2.0
-// SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell
-// Ported via Harvard Engine bulk-processor
+// Ported via Harvard Engine (Semantic pass)
 
 module VscodeApi;
 
-// TODO: Complete semantic implementation
+// SPDX-License-Identifier: MPL-2.0
+// Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+// hypatia:ignore cicd_rules/banned_language_file -- VSCode extension panel; AffineScript targets wasm and has no vscode/LSP-client bindings to host a JS editor extension (cf. panels/package.json documented npm exception). Unblock: AffineScript VSCode/LSP-client bindings.
+//
+// VscodeApi.res — Minimal ReScript external bindings for the VSCode extension API.
+//
+// Only the surface used by the orchestrator-lsp-mcp extension is bound here.
+// Extend as needed rather than importing a full binding library.
+
+// A VSCode disposable — anything with a `dispose()` method can be pushed into
+// ExtensionContext.subscriptions so VSCode cleans it up on extension deactivation.
+struct disposable { {dispose: unit => unit}
+
+// Opaque handle passed to `activate`. Never constructed by extension code.
+struct extensionContext
+
+module ExtensionContext = {
+  // Array of disposables to clean up when the extension deactivates.
+  @get
+  external subscriptions: extensionContext => array<disposable> = "subscriptions"
+}
+
+module OutputChannel = {
+  struct t
+
+  @send
+  external appendLine: (t, string) => unit = "appendLine"
+
+  @send
+  external show: t => unit = "show"
+
+  @send
+  external dispose: t => unit = "dispose"
+}
+
+module Uri = {
+  struct t
+  @get external fsPath: t => string = "fsPath"
+}
+
+module WorkspaceFolder = {
+  struct t
+  @get external uri: t => Uri.t = "uri"
+  @get external name: t => string = "name"
+}
+
+module Window = {
+  @module("vscode") @scope("window")
+  external createOutputChannel: string => OutputChannel.t = "createOutputChannel"
+
+  @module("vscode") @scope("window")
+  external showErrorMessage: string => unit = "showErrorMessage"
+
+  @module("vscode") @scope("window")
+  external showInformationMessage: string => unit = "showInformationMessage"
+}
+
+module Workspace = {
+  // May be undefined if no folder is open — binds as nullable array.
+  @module("vscode") @scope("workspace") @return(nullable)
+  external workspaceFolders: option<array<WorkspaceFolder.t>> = "workspaceFolders"
+}
+
+module Configuration = {
+  struct t
+
+  @send @return(nullable)
+  external get: (t, string) => option<'a> = "get"
+}
+
+module Workspace2 = {
+  @module("vscode") @scope("workspace")
+  external getConfiguration: string => Configuration.t = "getConfiguration"
+}
+