Fix #3629: resolve boulder progress from worktree plan

src/hooks/atlas/resolve-active-boulder-session.test.ts

@@ -1,7 +1,7 @@
 import { afterEach, beforeEach, describe, expect, test } from "bun:test"
 import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
 import { tmpdir } from "node:os"
-import { join } from "node:path"
+import { dirname, join } from "node:path"
 import { randomUUID } from "node:crypto"
 import { clearBoulderState, writeBoulderState } from "../../features/boulder-state"
 import { resolveActiveBoulderSession } from "./resolve-active-boulder-session"
@@ -96,4 +96,39 @@ describe("resolveActiveBoulderSession", () => {
     expect(result?.progress.isComplete).toBe(false)
     expect(result?.boulderState.session_ids).toContain("ses_appended")
   })
+
+  test("returns complete progress when a mirrored worktree plan is complete", async () => {
+    // given
+    const mainPlanPath = join(testDirectory, ".sisyphus", "plans", "worktree-plan.md")
+    const worktreeDirectory = join(tmpdir(), `resolve-active-boulder-worktree-${randomUUID()}`)
+    const worktreePlanPath = join(worktreeDirectory, ".sisyphus", "plans", "worktree-plan.md")
+    mkdirSync(dirname(mainPlanPath), { recursive: true })
+    mkdirSync(dirname(worktreePlanPath), { recursive: true })
+    writeFileSync(mainPlanPath, "# Plan\n- [ ] Main repo task\n", "utf-8")
+    writeFileSync(worktreePlanPath, "# Plan\n- [x] Worktree task\n", "utf-8")
+    writeBoulderState(testDirectory, {
+      active_plan: mainPlanPath,
+      started_at: "2026-01-02T10:00:00Z",
+      session_ids: ["ses_tracked"],
+      session_origins: { ses_tracked: "direct" },
+      plan_name: "worktree-plan",
+      worktree_path: worktreeDirectory,
+    })
+
+    try {
+      // when
+      const result = await resolveActiveBoulderSession({
+        client: { session: { get: async () => ({ data: {} }) } } as never,
+        directory: testDirectory,
+        sessionID: "ses_tracked",
+      })
+
+      // then
+      expect(result).not.toBeNull()
+      expect(result?.progress.isComplete).toBe(true)
+      expect(result?.progress.completed).toBe(1)
+    } finally {
+      rmSync(worktreeDirectory, { recursive: true, force: true })
+    }
+  })
 })