Add configurable worktree target path and session run diagnostics

tests/resource-suballocation.test.ts

@@ -18,6 +18,7 @@ function parentSnapshot(): DiscoverySnapshot {
           worktreeRoot: "/repo/.ai_ops/worktrees",
           worktreePath: "/repo/.ai_ops/worktrees/parent",
           baseRef: "HEAD",
+          targetPath: "src/agents",
         },
       },
       {
@@ -55,6 +56,7 @@ test("builds deterministic child suballocation requests", () => {
   const gitRequest = requests.find((entry) => entry.kind === "git-worktree");
   assert.ok(gitRequest);
   assert.equal(typeof gitRequest.options?.rootDirectory, "string");
+  assert.equal(gitRequest.options?.targetPath, "src/agents");
 
   const portRequest = requests.find((entry) => entry.kind === "port-range");
   assert.ok(portRequest);