docs(lark-search): improve search workflow from eval run base-b1m-selected2-v2-20260521

[BytedanceSearch]

Eval Summary

• Run: base-b1m-selected2-v2-20260521
• Dataset size: 2
• Scored: 2
• Total: 2/30 (6.7%)
• Primary bottleneck: search_strategy

Findings

• F-002 [medium] tool_capability/drive -> shortcuts/drive: 没有可用 evidence_top_results；drive search shortcut 需要返回更稳定的标题、id/token、时间和摘要字段。 (cases: case_002)
• F-001 [low] search_strategy/drive -> skills/lark-drive/references/lark-drive-search.md: recall=1；应在 drive 搜索中优先使用 query 的时间/人员/状态过滤，并用非污染 evidence_top_results 验证目标资源。 (cases: case_001)
• F-003 [low] search_strategy/drive -> skills/lark-drive/references/lark-drive-search.md: recall=0；应在 drive 搜索中优先使用 query 的时间/人员/状态过滤，并用非污染 evidence_top_results 验证目标资源。 (cases: case_002)

Review Notes

This PR was generated from eval-search findings. Reviewers should check that
changes are domain-specific, generic, and not tailored to one case's exact gold
answer.

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[codecov]

Codecov Report

❌ Patch coverage is 79.65116% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.78%. Comparing base (c02a38f) to head (014ae49).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
shortcuts/drive/drive_search.go	79.65%	30 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1022      +/-   ##
==========================================
+ Coverage   67.66%   67.78%   +0.11%     
==========================================
  Files         576      590      +14     
  Lines       54510    55262     +752     
==========================================
+ Hits        36885    37460     +575     
- Misses      14566    14688     +122     
- Partials     3059     3114      +55     

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[BytedanceSearch]

Closing this draft because the eval root cause is a broker capability gap around original creator vs owner, not the drive output shape change proposed here.