feat(mcp): add toolCallTimeoutMs, timeout/reconnect/error handling

- Add toolCallTimeoutMs to stdio MCP config with 60s default
- tools/call runs under timeout with dedicated Timeout error
- Handle malformed JSON/broken protocol as InvalidResponse
- Reset/reconnect stdio state on child exit or transport drop
- Add tests: slow timeout, invalid JSON response, stdio reconnect
- Verified: cargo test -p runtime 113 passed, clippy clean

rust/crates/runtime/src/config.rs

@@ -106,6 +106,7 @@ pub struct McpStdioServerConfig {
     pub command: String,
     pub args: Vec<String>,
     pub env: BTreeMap<String, String>,
+    pub tool_call_timeout_ms: Option<u64>,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -791,6 +792,7 @@ fn parse_mcp_server_config(
             command: expect_string(object, "command", context)?.to_string(),
             args: optional_string_array(object, "args", context)?.unwrap_or_default(),
             env: optional_string_map(object, "env", context)?.unwrap_or_default(),
+            tool_call_timeout_ms: optional_u64(object, "toolCallTimeoutMs", context)?,
         })),
         "sse" => Ok(McpServerConfig::Sse(parse_mcp_remote_server_config(
             object, context,
@@ -914,6 +916,27 @@ fn optional_u16(
     }
 }
 
+fn optional_u64(
+    object: &BTreeMap<String, JsonValue>,
+    key: &str,
+    context: &str,
+) -> Result<Option<u64>, ConfigError> {
+    match object.get(key) {
+        Some(value) => {
+            let Some(number) = value.as_i64() else {
+                return Err(ConfigError::Parse(format!(
+                    "{context}: field {key} must be a non-negative integer"
+                )));
+            };
+            let number = u64::try_from(number).map_err(|_| {
+                ConfigError::Parse(format!("{context}: field {key} is out of range"))
+            })?;
+            Ok(Some(number))
+        }
+        None => Ok(None),
+    }
+}
+
 fn parse_bool_map(value: &JsonValue, context: &str) -> Result<BTreeMap<String, bool>, ConfigError> {
     let Some(map) = value.as_object() else {
         return Err(ConfigError::Parse(format!(