✨ feat(plan_progress): auto-detect env for blocked plans

tests/test_plan_progress_cli.py

@@ -2,6 +2,7 @@ import subprocess
 import sys
 import tempfile
 import unittest
+import platform
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
@@ -18,6 +19,13 @@ def run_cli(*args, cwd=None):
 
 
 class PlanProgressCliTests(unittest.TestCase):
+    def _current_env(self) -> str:
+        system = platform.system().lower()
+        mapping = {"windows": "windows", "linux": "linux", "darwin": "darwin"}
+        if system not in mapping:
+            self.skipTest(f"Unsupported environment: {system}")
+        return mapping[system]
+
     def test_select_seeds_progress_when_missing(self):
         with tempfile.TemporaryDirectory() as tmp_dir:
             root = Path(tmp_dir)
@@ -82,6 +90,42 @@ class PlanProgressCliTests(unittest.TestCase):
             self.assertEqual(result.returncode, 0, msg=result.stderr)
             self.assertEqual(result.stdout.strip(), "docs/plans/2026-01-02-b.md")
 
+    def test_select_returns_env_blocked_plan_without_flag(self):
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            root = Path(tmp_dir)
+            plans_dir = root / "docs" / "plans"
+            plans_dir.mkdir(parents=True)
+            (plans_dir / "2026-01-05-env.md").write_text("env", encoding="utf-8")
+
+            progress = root / "memory-bank" / "progress.md"
+            progress.parent.mkdir(parents=True)
+            env = self._current_env()
+            progress.write_text(
+                "\n".join(
+                    [
+                        "# Plan 状态",
+                        "",
+                        "<!-- plan-status:start -->",
+                        f"- [ ] `2026-01-05-env.md` blocked: env:{env}:Task1",
+                        "<!-- plan-status:end -->",
+                        "",
+                    ]
+                ),
+                encoding="utf-8",
+            )
+
+            result = run_cli(
+                "select",
+                "-plans",
+                "docs/plans",
+                "-progress",
+                "memory-bank/progress.md",
+                cwd=root,
+            )
+
+            self.assertEqual(result.returncode, 0, msg=result.stderr)
+            self.assertEqual(result.stdout.strip(), "docs/plans/2026-01-05-env.md")
+
     def test_record_updates_line(self):
         with tempfile.TemporaryDirectory() as tmp_dir:
             root = Path(tmp_dir)