[Bug] cleo find with empty string errors instead of returning all tasks

[kryptobaseddev]

Bug Report

Running cleo find "" returns an error requiring a search query, but agents often need to list all tasks for discovery.

Steps to reproduce:

1. Run cleo find ""
2. Expect: all tasks returned (or a helpful suggestion)
3. Actual: E_INVALID_INPUT: Search query or --id is required

Expected behavior: Either:

• Empty string search returns all tasks (like cleo find with a wildcard)
• Or the error message suggests cleo find '*' or another way to list all tasks

Context: The CLEO protocol injection doc says 'ALWAYS use tasks find for discovery. NEVER use tasks list for browsing.' but cleo find requires a non-empty query, creating a gap when agents need to discover what tasks exist without knowing any keywords.

Severity: Minor
Area: cli

Are you using an AI agent?

Yes - AI agent filed this issue

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Environment

Component	Version
CLEO	2026.2.1
Node.js	v24.13.1
OS	linux 6.19.8-200.fc43.x86_64 x64 (x64)
Shell	/bin/bash
gh CLI	gh version 2.87.3 (2026-02-23)
Install	/home/keatonhoskins/.npm-global/bin/cleo

[kryptobaseddev]

Fixed in v2026.4.22 (d72ff05). Changed falsy check to strict null check for empty string queries.