feat: complete INSPECT/SEARCH support, fix PERFORM/EVAL coverage marking

- Add INSPECT (TALLYING/REPLACING/CONVERTING) with BEFORE/AFTER INITIAL
- Add SEARCH/SEARCH ALL with element-assignment path enumeration
- Fix _mark_perform compound condition marking via evaluate_tree
- Fix EVALUATE TRUE prior_false to collect all MC/DC false sets
- Add impossible path filtering (Pass A.5) with trace-to-root conflict detection
- Fix multi-line PERFORM VARYING parsing (VARYING/FROM/BY/UNTIL on separate lines)
- Remove dead code: agents.py LLM parser (replaced by rule-based _BrParser)
- 59 unit tests passing, 5 integration programs verified

cobol_testgen/__init__.py

@@ -7,10 +7,7 @@ from pathlib import Path
 
 # ── 配置（必须放在本地模块导入之前，避免循环导入） ──
 
-CONFIG = {
-    "proc_parser": "rule",   # "rule" | "ai"
-    "llm_generator": False,   # True=启用LLM路径生成; False=纯规则引擎
-}
+CONFIG = {}
 
 from .read import preprocess, extract_data_division, extract_procedure_division
 from .read import resolve_copybooks, parse_data_division, parse_file_section, scan_open_statements
@@ -18,7 +15,6 @@ from .core import build_branch_tree, classify_field_roles, _init_child_names
 from .cond import parse_single_condition, is_field
 from .design import enum_paths, generate_records, _filter_stop
 from .output import output_json, output_input_files
-from . import agents
 from .coverage import run_coverage, generate_coverage_index
 
 logger = logging.getLogger(__name__)
@@ -233,14 +229,7 @@ def main():
         assignments = {}
 
         if proc_div:
-            if CONFIG["proc_parser"] == "ai":
-                try:
-                    result = agents.parse_proc_division_ai(proc_div, fields_dict)
-                    branch_tree, assignments = result
-                except NotImplementedError:
-                    branch_tree, assignments = build_branch_tree(proc_div, fields_dict)
-            else:
-                branch_tree, assignments = build_branch_tree(proc_div, fields_dict)
+            branch_tree, assignments = build_branch_tree(proc_div, fields_dict)
 
             roles = classify_field_roles(branch_tree, assignments, fields_dict,
                                          source=preprocessed, proc_text=proc_div)
@@ -281,14 +270,14 @@ def main():
         cov_result = run_coverage(branch_tree, branch_paths_with_assigns, fields_dict,
                                   source, cov_prefix, index_relpath=index_relpath)
 
-        records = generate_records(branch_paths_with_assigns, fields_dict, assignments, file_sec=file_sec)
+        records, kept_path_cons = generate_records(branch_paths_with_assigns, fields_dict, assignments, file_sec=file_sec)
 
         # 输出 JSON（完整文件）
         outpath = outdir / (filepath.stem + '.json')
         output_json(records, outpath, roles,
                     fd_fields=fd_fields, field_to_fd=field_to_fd,
                     open_dir=open_dir,
-                    path_cons_list=[c for c, a in branch_paths_with_assigns])
+                    path_cons_list=kept_path_cons)
 
         # 输出入力 JSON（按 FD 拆分）
         output_input_files(records, outdir, filepath.stem, roles,