feat: phase2 review fixes

- TIME injection: change from spaces to '2500' (hour>23) for NUMVAL trigger
- Runner: add .resolve() to work_dir to fix chdir+relative path breakage
- Coverage: per-target field overrides for DP#9-#12 (START-DATE=20240115 etc.)
- .gitignore: add compilation artifacts, temp scripts, test outputs

.gitignore

@@ -47,5 +47,20 @@ _test_flatfiles/
 gixsql/
 cobol-tna-system/
 
-# 詳細設計書（設計原稿、公開禁止）
-詳細設計書/
+# Compilation artifacts
+SUB*.c
+SUB*.c.h
+SUB*.c.l.h
+SUB*.i
+
+# Temp scripts
+diagnose_*.py
+
+# Generated reports/documents
+SUMMARY.md
+docs/prompt-template.md
+docs/plans/
+
+# Test output dirs
+output/
+test_output/