`_load_blackboard_state` silently swallows corruption and has no type guard on items

[lilyt3]

_load_blackboard_state silently swallows corruption and has no type guard on items

Severity: Medium
File: src/cain_agent/workspace_ext.py:27-38

The blackboard state loader catches all exceptions with a bare except Exception: pass, including programming errors that should surface:

def _load_blackboard_state(self) -> None:
    ideas_path = self.path(self.IDEAS_FILE)
    if ideas_path.exists():
        try:
            data = self.read_json(self.IDEAS_FILE)
            for item in data:
                idea = Idea(**item)
                self.blackboard._ideas[idea.idea_id] = idea
        except Exception:
            pass

If data is a dict instead of a list (corrupted file), iterating over it yields dict keys (strings), and Idea(**item) raises TypeError — which is swallowed. The user gets no signal that their persisted state was lost. Additionally, self.read_json raises WorkspaceCorruptError for malformed JSON, which is also silently eaten, making it impossible to diagnose a corrupted workspace.

Why it matters

A corrupted ideas.json causes silent data loss: the workspace appears to load successfully but all persisted ideas are gone, with no warning or error to alert the operator.

[cdxiaodong]

确认属实并已修复(main 665e3b9,合并于 4096e00):_load_blackboard_state 的 bare except 收窄为 ValueError | TypeError | KeyError,并在降级为空状态前向 stderr 输出可诊断告警;新增顶层/条目类型守卫(ideas.json 应为 list[dict])。损坏不再静默——workspace 看似正常加载实则丢状态的情况现在会留下明确信号。Issue 暂保持开放。