refactor(jsonl-parser): replace _parse_tool_result if/elif with dispa… (#31)

* refactor(jsonl-parser): replace _parse_tool_result if/elif with dispatch table

Implement _TOOL_RESULT_DISPATCH as an ordered sequence of (predicate,
builder) pairs with explicit _tool_result_pred_* / _tool_result_build_*
helpers so new tool-result shapes register in one place. Preserve legacy
branch order and unknown fallback; no intentional behavior change.

* fix(jsonl-parser): safe web_search result_count + slug Optional typing (#29)

* docs: align Issue 29 guide with PR framing for #29

Author: clean6378-max-it

tests/test_jsonl_parser.py

@@ -171,6 +171,13 @@ def test_web_search_result(self):
         assert r["query"] == "q"
         assert r["result_count"] == 1
 
+    def test_web_search_results_none_or_non_sized_yields_zero_count(self):
+        r = _parse_tool_result({"query": "q", "results": None})
+        assert r["result_type"] == "web_search"
+        assert r["result_count"] == 0
+        r2 = _parse_tool_result({"query": "q", "results": "not-a-list"})
+        assert r2["result_count"] == 0
+
     def test_web_fetch_result(self):
         r = _parse_tool_result({"url": "https://x", "code": 200, "durationMs": 40})
         assert r["result_type"] == "web_fetch"