Update: 将子项目从 submodule 转为完整内容

- 移除 GovAI, nomifun-tauri, 算力盒子 的 submodule 引用
- 添加所有子项目的完整源代码
- 保留原始 .git 为 .git.bak 备份

nomifun-tauri/crates/agent/nomi-memory/src/error.rs

@@ -0,0 +1,73 @@
+use std::path::PathBuf;
+
+/// Errors that can occur within the memory system.
+#[derive(Debug, thiserror::Error)]
+pub enum MemoryError {
+    /// File I/O error.
+    #[error("memory I/O error: {0}")]
+    Io(#[from] std::io::Error),
+
+    /// YAML frontmatter failed to parse.
+    #[error("failed to parse frontmatter in {path}: {source}")]
+    FrontmatterParse {
+        path: PathBuf,
+        source: serde_yaml::Error,
+    },
+
+    /// Memory path failed security validation.
+    #[error("path validation failed: {0}")]
+    PathValidation(String),
+}
+
+pub type Result<T> = std::result::Result<T, MemoryError>;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn io_error_display() {
+        let inner = std::io::Error::new(std::io::ErrorKind::NotFound, "gone");
+        let err = MemoryError::Io(inner);
+        let msg = err.to_string();
+        assert!(msg.contains("I/O"), "should mention I/O: {msg}");
+        assert!(msg.contains("gone"), "should contain inner message: {msg}");
+    }
+
+    #[test]
+    fn io_error_from_conversion() {
+        let inner = std::io::Error::new(std::io::ErrorKind::PermissionDenied, "denied");
+        let err: MemoryError = inner.into();
+        assert!(matches!(err, MemoryError::Io(_)));
+    }
+
+    #[test]
+    fn path_validation_display() {
+        let err = MemoryError::PathValidation("relative path".into());
+        let msg = err.to_string();
+        assert!(
+            msg.contains("relative path"),
+            "should contain reason: {msg}"
+        );
+        assert!(
+            msg.contains("validation"),
+            "should mention validation: {msg}"
+        );
+    }
+
+    #[test]
+    fn frontmatter_parse_display() {
+        // Trigger a real serde_yaml error
+        let yaml_err = serde_yaml::from_str::<serde_yaml::Value>(":\n  :\n---").unwrap_err();
+        let err = MemoryError::FrontmatterParse {
+            path: PathBuf::from("/tmp/test.md"),
+            source: yaml_err,
+        };
+        let msg = err.to_string();
+        assert!(msg.contains("/tmp/test.md"), "should contain path: {msg}");
+        assert!(
+            msg.contains("frontmatter"),
+            "should mention frontmatter: {msg}"
+        );
+    }
+}