Add Hermes Tweet to marketing growth plugins

[kriptoburak]

Summary:

• Add Hermes Tweet to the Marketing Growth plugin list.
• Link to the public repository because this catalog entry points to an external Hermes Agent plugin.
• Describe the X/Twitter research, monitoring, drafting, follower export, and approval-gated action fit.

Validation:

• git diff --check

License note:

• GitHub license API did not expose a recognized license for this repository during review, although a LICENSE file is present in the repository.