fix: handle Windows drive-letter paths across the codebase (#148)

* Add metrics collection and terminal performance tests

* fix: handle Windows drive-letter paths across the codebase

Windows paths like C:\Users\foo\project were broken in multiple places:
- agent-storage slugified D:\MyProject as D:-MyProject (illegal colon)
- terminal-manager rejected all non-/ paths as relative
- bootstrap parser misparsed drive colons as TCP host:port
- daemon/client connection helpers misclassified Windows paths
- CLI cwd filtering used hardcoded / separators
- checkout-git worktree detection used hardcoded / in path checks
- worktree archive used split("/").pop() instead of path.basename()

All path helpers now normalize separators and handle Windows
drive letters with case-insensitive comparison where needed.

packages/server/src/terminal/terminal-manager.test.ts

@@ -73,6 +73,12 @@ describe("TerminalManager", () => {
       await expect(manager.getTerminals("tmp")).rejects.toThrow("cwd must be absolute path");
     });
 
+    it("accepts Windows absolute paths", async () => {
+      manager = createTerminalManager();
+      await expect(manager.getTerminals("C:\\Users\\foo\\project")).resolves.not.toThrow();
+      await expect(manager.getTerminals("D:\\MyProject")).resolves.not.toThrow();
+    });
+
     it("creates separate terminals for different cwds", async () => {
       manager = createTerminalManager();
       const tmpTerminals = [await manager.createTerminal({ cwd: "/tmp" })];
@@ -121,6 +127,18 @@ describe("TerminalManager", () => {
       );
     });
 
+    it("does not reject Windows absolute paths as relative", async () => {
+      manager = createTerminalManager();
+      // Should pass path validation (not throw "cwd must be absolute path").
+      // The terminal may or may not spawn successfully on non-Windows hosts,
+      // so we only assert the validation error is absent.
+      try {
+        await manager.createTerminal({ cwd: "C:\\Users\\foo\\project" });
+      } catch (error) {
+        expect((error as Error).message).not.toBe("cwd must be absolute path");
+      }
+    });
+
     it("inherits registered env for the worktree root cwd", async () => {
       await withShell("/bin/sh", async () => {
         manager = createTerminalManager();