fix(agents): resolve typed paths against Windows project roots

src/features/agents/agents.test.ts

@@ -288,5 +288,7 @@ describe("typed path references", () => {
     expect(resolveTyped("/r/idea", "../kalo/a.ts")).toBe("/r/kalo/a.ts");
     expect(resolveTyped("/r/idea", "./src")).toBe("/r/idea/src");
     expect(resolveTyped("/r/idea", "/etc/hosts")).toBe("/etc/hosts");
+    expect(resolveTyped("C:\\r\\idea", "../kalo/a.ts")).toBe("C:/r/kalo/a.ts");
+    expect(resolveTyped("C:\\r", "../../x")).toBe("C:/x");
   });
 });

src/features/agents/composerModel.ts

@@ -77,14 +77,19 @@ function inOrder(text: string, query: string): boolean {
 /** Whether an `@` query is a typed-out path (`../x`, `./x`, `/x`) rather than a project file search. */
 export const isPathQuery = (query: string) => /^(\.\.?(\/|$)|\/)/.test(query);
 
+const isDrive = (part: string | undefined) => !!part && /^[A-Za-z]:$/.test(part);
+
 /** `rel` (as typed after `@`) resolved against `root`, `.` and `..` folded lexically. */
 export function resolveTyped(root: string, rel: string): string {
   const out: string[] = [];
-  for (const part of (rel.startsWith("/") ? rel : `${root}/${rel}`).split("/")) {
-    if (part === "..") out.pop();
-    else if (part && part !== ".") out.push(part);
+  const path = rel.startsWith("/") ? rel : `${root.replace(/\\/g, "/")}/${rel}`;
+  for (const part of path.split("/")) {
+    if (part === "..") {
+      // Never fold away a Windows drive (`C:`).
+      if (out.length > 1 || !isDrive(out[0])) out.pop();
+    } else if (part && part !== ".") out.push(part);
   }
-  return `/${out.join("/")}`;
+  return isDrive(out[0]) ? out.join("/") : `/${out.join("/")}`;
 }
 
 /** `@rel` with a line range suffix when given ("@src/a.rs:10-20"). */