feat: add conservative code location repair workflow

[Nerdlet369]

Summary

Conservative code location repair workflow for data/entries.jsonl.

Repair Pipeline

Tier	Strategy	Description
1	correct	Current {file, line, code} already matches
2	nearby_fix	Searches ±5 lines; expands range for multi-line code
3	file_search	Searches entire file
4	repo_search	Searches repository snapshot; repairs file + line on unique match
—	degenerate	Single closing braces (}, ), ];) never auto-fixed → flagged for human review

Ambiguous matches (0 hit, multiple hits, fetch failure) are left untouched and recorded for manual review.

Result

Processed: 408 entries
Auto-fixed: 102   (100 nearby + 2 file)
Needs human: 72   (17 degenerate snippets)
Errors:     0

[Nerdlet369]

已完成实现并提交 PR：#43

该方案采用保守修复策略，包含：

1. 原位验证
2. line ± 5 搜索
3. 文件级搜索
4. 仓库级唯一命中搜索

并输出：

• entries.fixed.jsonl
• fix_diff.csv
• needs_human.csv

[Nerdlet369]

Update（最新改动同步）

本次 push 在原方案基础上补充了工程化验证环节，核心改动：

1. 单元测试：新增 tests/test_fix_entries.py，覆盖 normalize_code、search_code_in_lines、行号解析、退化片段判断、desc 同步等 21 个用例
2. 独立校验脚本：新增 scripts/verify_fix.py，检查 schema / diff 一致性 / code 字段完整性 / 幂等性
3. 退化片段过滤：单独的 } / ) / ]; 等无意义片段不再自动修复，明确写入 needs_human.csv
4. desc 同步：行号变化时保守同步 desc 中的行号引用；fix_diff.csv 新增 original_desc / new_desc 列

最新全量结果：

Processed: 408 entries
Auto-fixed: 102   (100 nearby + 2 file)
Needs human: 72   (17 degenerate snippets)
Errors:     0

[Nerdlet369]

Quick note: fix_entries.py output is idempotent —
re-running on entries.fixed.jsonl produces 0 additional fixes,
confirming all repairs are convergent.