fix(sdk): list_documents review followups

[rejojer]

Addresses PR #522 review findings 2–7.

• Forward recursive value instead of hardcoding True (string 'false' was silently inverted)
• Raise client-side limit cap from 100 to 10000 (server changed four months ago)
• Accept folder_id='root'/'' in local mode (matches agent_tools pattern)
• Fix wire test to assert param presence, not identity
• Delete restating comments

Review: #522

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
🔒 Security Review	✅ Completed 2026-09-21T08:28:21.723157Z	059aea0	PR opened

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