docs(lark-task): clarify list task search routing

[BytedanceSearch]

Summary

• Clarify when task list-style requests should use task +get-my-tasks or task +get-related-tasks instead of keyword search.
• Document that task +get-my-tasks has an implicit assignee/负责人 filter for the current login user.
• Clarify that another person's assignee list should resolve that person to open_id and use task +search --assignee.
• Keep this PR scoped to skills/lark-task/** 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:

• Task cases 002/003 need list-style task handling and field-based validation instead of relying on search ranking alone.
• Task summaries should validate owner/assignee/follower, completion state, due time, and task GUID before computing priority or completion-rate summaries.

Validation

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

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 (69bfa02).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #846   +/-   ##
=======================================
  Coverage   65.90%   65.90%           
=======================================
  Files         518      518           
  Lines       48830    48830           
=======================================
  Hits        32181    32181           
  Misses      13882    13882           
  Partials     2767     2767           

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[agicy]

为什么 分配给我的 对应附带 --complete（对应 完成状态）和 --due（对应 截止时间），用 负责人 也许更合适？