feat: add driving flag to relationship query responses

Add computed driving flag to all relationship queries (list_relationships,
get_predecessors, get_successors). A relationship is marked as driving when
the predecessor's early end date plus lag determines the successor's early
start date.

Changes:
- Add early_start_date and early_end_date columns to activities schema
- Parse early dates from TASK table in XER files
- Implement is_driving_relationship() helper with 24hr tolerance for
  calendar gaps
- Update all relationship queries to compute and return driving flag
- Add contract and unit tests for driving flag functionality
- Update spec, contracts, and documentation

tests/unit/test_table_handlers.py

@@ -87,6 +87,76 @@ class TestTaskHandler:
         handler = TaskHandler()
         assert handler.table_name == "TASK"
 
+    def test_parse_early_dates(self) -> None:
+        """Handler should parse early_start_date and early_end_date from TASK row."""
+        from xer_mcp.parser.table_handlers.task import TaskHandler
+
+        handler = TaskHandler()
+
+        fields = [
+            "task_id",
+            "proj_id",
+            "wbs_id",
+            "task_code",
+            "task_name",
+            "task_type",
+            "status_code",
+            "target_start_date",
+            "target_end_date",
+            "early_start_date",
+            "early_end_date",
+            "total_float_hr_cnt",
+            "driving_path_flag",
+        ]
+        values = [
+            "2001",
+            "1001",
+            "100",
+            "A1000",
+            "Site Prep",
+            "TT_Task",
+            "TK_NotStart",
+            "2026-01-02 07:00",
+            "2026-01-08 15:00",
+            "2026-01-02 07:00",
+            "2026-01-08 15:00",
+            "0",
+            "Y",
+        ]
+
+        result = handler.parse_row(fields, values)
+
+        assert result is not None
+        assert result["early_start_date"] == "2026-01-02T07:00:00"
+        assert result["early_end_date"] == "2026-01-08T15:00:00"
+
+    def test_parse_missing_early_dates(self) -> None:
+        """Handler should handle missing early dates gracefully."""
+        from xer_mcp.parser.table_handlers.task import TaskHandler
+
+        handler = TaskHandler()
+
+        fields = [
+            "task_id",
+            "proj_id",
+            "task_code",
+            "task_name",
+            "task_type",
+        ]
+        values = [
+            "2001",
+            "1001",
+            "A1000",
+            "Site Prep",
+            "TT_Task",
+        ]
+
+        result = handler.parse_row(fields, values)
+
+        assert result is not None
+        assert result["early_start_date"] is None
+        assert result["early_end_date"] is None
+
 
 class TestTaskpredHandler:
     """Tests for TASKPRED table handler."""