fix(daemon): launch LSP servers with caller env

src/daemonProtocol.ts

@@ -10,6 +10,28 @@ import * as os from "node:os";
 import * as path from "node:path";
 import { spawn } from "node:child_process";
 
+// Launch Context - Captures the caller/session environment used when the
+// daemon spawns a new language server. Running servers keep their original
+// process env; later requests for the same root reuse the existing server.
+export interface LaunchContext {
+  env: Record<string, string>;
+}
+
+// Build Launch Context - Convert Node's optional-valued process.env into the
+// concrete string map accepted by child_process.spawn(). Env contents are
+// sensitive: keep them internal to requests and never log or expose them.
+export function buildLaunchContext(
+  env: NodeJS.ProcessEnv = process.env,
+): LaunchContext {
+  return {
+    env: Object.fromEntries(
+      Object.entries(env).filter((entry): entry is [string, string] => {
+        return typeof entry[1] === "string";
+      }),
+    ),
+  };
+}
+
 // Request Shapes - Sent client -> daemon.
 export type DaemonRequest =
   | {
@@ -18,8 +40,15 @@ export type DaemonRequest =
       file: string;
       method: string;
       params: Record<string, unknown>;
+      launch: LaunchContext;
+    }
+  | {
+      id: number;
+      op: "diagnostics";
+      file: string;
+      timeoutMs?: number;
+      launch: LaunchContext;
     }
-  | { id: number; op: "diagnostics"; file: string; timeoutMs?: number }
   | { id: number; op: "status" }
   | { id: number; op: "shutdown" }
   | { id: number; op: "destroy_server"; serverId?: string };
@@ -30,8 +59,14 @@ export type DaemonRequestWithoutId =
       file: string;
       method: string;
       params: Record<string, unknown>;
+      launch: LaunchContext;
+    }
+  | {
+      op: "diagnostics";
+      file: string;
+      timeoutMs?: number;
+      launch: LaunchContext;
     }
-  | { op: "diagnostics"; file: string; timeoutMs?: number }
   | { op: "status" }
   | { op: "shutdown" }
   | { op: "destroy_server"; serverId?: string };