Harden reconciliation conflict handling

api/services/workplan_files.py

@@ -66,6 +66,19 @@ def task_block_linked(path: Path, task_id: uuid.UUID) -> bool:
     return _task_block_for_task(path, task_id) is not None
 
 
+def workplan_status(path: Path) -> str | None:
+    status = _frontmatter(path).get("status")
+    return str(status).strip() if status is not None else None
+
+
+def task_block_status(path: Path, task_id: uuid.UUID) -> str | None:
+    meta = _task_block_for_task(path, task_id)
+    if meta is None:
+        return None
+    status = meta.get("status")
+    return str(status).strip() if status is not None else None
+
+
 def patch_workplan_status(path: Path, status: str) -> bool:
     return _patch_frontmatter_field(path, "status", status)
 
@@ -140,7 +153,10 @@ def _patch_frontmatter_field(path: Path, key: str, value: str) -> bool:
 
 
 def _task_block_for_task(path: Path, task_id: uuid.UUID) -> dict[str, Any] | None:
-    text = path.read_text(encoding="utf-8")
+    try:
+        text = path.read_text(encoding="utf-8")
+    except OSError:
+        return None
     for match in _TASK_BLOCK_RE.finditer(text):
         meta = _parse_task_block(match.group(1))
         if str(meta.get("state_hub_task_id", "")).strip().strip('"') == str(task_id):