docs(lark-drive): improve search evidence guidance

[BytedanceSearch]

Summary

• Clarify drive list/stat requests should use filtered empty-query browsing, not generic action words as keywords.
• Replace fixed relative-date examples with runtime placeholders.
• Add pagination, de-duplication, evidence validation, and query-expansion guidance for drive search.
• Keep this PR scoped to skills/lark-drive/** only.

Eval Signal

Runs:

• tests/eval-search/runs/2026-05-12T06-14Z-multientity-sandbox-a970
• tests/eval-search/runs/2026-05-13Tfull-critical-info-sandbox

Observed:

• Drive cases 014/015 need empty-query filtered browsing for list/stat requests and pagination before counting.
• Drive case 019 needs content query expansion and non-polluted evidence validation.

Validation

• git diff --check
• PR diff is scoped to skills/lark-drive/**.

Docs-only change; no unit tests were run.

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• Commit unit tests in branch eval-search-drive-routing-docs-a970

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.90%. Comparing base (b0c9a4d) to head (fbb3e42).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #864   +/-   ##
=======================================
  Coverage   65.90%   65.90%           
=======================================
  Files         518      518           
  Lines       48830    48830           
=======================================
  Hits        32181    32181           
  Misses      13882    13882           
  Partials     2767     2767           

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