add MictoNode for testnet

[MictoNode]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds a new testnet validator configuration file for MictoNode with ID 224. The submission follows the correct format and naming convention.

• File named correctly using the SECP key as the filename
• All required fields present: id, name, secp, bls, website, description, logo, x
• SECP key length is 66 characters (correct)
• BLS key length is 96 characters (correct)
• Validator ID 224 is not currently used in the testnet directory
• JSON structure matches the example schema
• Logo URL points to a Keybase processed upload
• Website and social media links are properly formatted with HTTPS

The CI validation workflow will verify the on-chain keys match the provided values.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change is a straightforward addition of a validator configuration file that follows all repository conventions. The file structure matches the required schema, uses correct field types, and the filename matches the SECP key. The validator ID is unique, and all required fields are present with valid values. The automated CI checks will verify on-chain key matching.
• No files require special attention

Important Files Changed

Filename	Overview
testnet/0342dee41016773f4d958af42a065f675f31ee7986ed51cdbf2f5e7109809631b6.json	New testnet validator info for MictoNode (ID: 224) with all required fields properly formatted

_{Last reviewed commit: 90c1ffb}