fix(runtime): SSE行缓冲 — 修复glm tool call参数截断丢失

根因: OpenAI driver的SSE解析直接按TCP chunk分行,
当glm的JSON响应被拆成多个TCP包时,SSE data行被截断,
导致tool call arguments丢失(input={})。

修复:
1. 添加pending_line缓冲区,跨chunk累积不完整的SSE行
2. 只处理完整的行(\n结尾),未完成的保留到下次
3. researcher.infer_action()增加更多字段推断(search/keyword/q等)

验证: 99 tests PASS, 160 hands tests PASS

crates/zclaw-runtime/src/driver/openai.rs

@@ -163,6 +163,7 @@ impl LlmDriver for OpenAiDriver {
             let mut current_tool_id: Option<String> = None;
             let mut sse_event_count: usize = 0;
             let mut raw_bytes_total: usize = 0;
+            let mut pending_line = String::new(); // Buffer for incomplete SSE lines
 
             while let Some(chunk_result) = byte_stream.next().await {
                 let chunk = match chunk_result {
@@ -180,13 +181,21 @@ impl LlmDriver for OpenAiDriver {
                 if raw_bytes_total <= 600 {
                     tracing::debug!("[OpenAI:stream] RAW chunk ({} bytes): {:?}", text.len(), &text[..text.len().min(500)]);
                 }
-                for line in text.lines() {
+                // Accumulate text and split by lines, handling incomplete last line
+                pending_line.push_str(&text);
+                // Extract complete lines (ending with \n), keep the rest pending
+                let mut complete_lines: Vec<String> = Vec::new();
+                while let Some(pos) = pending_line.find('\n') {
+                    complete_lines.push(pending_line[..pos].to_string());
+                    pending_line = pending_line[pos + 1..].to_string();
+                }
+                for line in complete_lines {
                     let trimmed = line.trim();
                     if trimmed.is_empty() || trimmed.starts_with(':') {
                         continue; // Skip empty lines and SSE comments
                     }
                     // Handle both "data: " (standard) and "data:" (no space)
-                    let data = if let Some(d) = trimmed.strip_prefix("data: ") {
+                    let data: Option<&str> = if let Some(d) = trimmed.strip_prefix("data: ") {
                         Some(d)
                     } else if let Some(d) = trimmed.strip_prefix("data:") {
                         Some(d.trim_start())