docs(lark-im): clarify message activity search

[BytedanceSearch]

Summary

• Clarify that message activity review should keep --query "" and rely on sender/chat/time filters.
• Replace fixed relative-date examples with runtime placeholders.
• Add message_id, sender, chat, and create-time evidence validation guidance.
• Keep this PR scoped to skills/lark-im/** 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:

• The IM bot-interaction case needs empty-query activity review plus message_id/chat-context evidence validation.
• Source data may contain concrete om_... message IDs or ou_... user IDs; those should be treated as strong recall targets.

Validation

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

Docs-only change; no unit tests were run.

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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 (42d759e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #865   +/-   ##
=======================================
  Coverage   65.90%   65.90%           
=======================================
  Files         518      518           
  Lines       48830    48830           
=======================================
  Hits        32181    32181           
  Misses      13882    13882           
  Partials     2767     2767           

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