Add Congressional Stock Brain to Commercial & Proprietary Services

[jsmontelius89]

Adding Congressional Stock Brain to the Commercial & Proprietary Services section.

Congressional Stock Brain (congressionalstockbrain.com) is a free AI-powered fintech tool specifically focused on U.S. congressional STOCK Act disclosures. It ingests all House and Senate filings and scores each trade for signal strength using AI.

Unlike VertData (which is institutional-grade and covers 13F, CFTC, etc.), CSB is:

• Specifically focused on congressional STOCK Act disclosures only
• Free tier available (core features free)
• Designed for retail investors, not institutions
• Includes a natural language query console ("Ask the Brain") powered by Claude AI

Format follows CONTRIBUTING.md guidelines. Placed after VertData in alphabetical order within the section.

[wilsonfreitas]

Thanks for the contribution! We appreciate you thinking of Congressional Stock Brain for the list.
There are a few formatting issues to address before we can merge:

1. Entry format — The line currently starts with - - (double dash) but should start with just - (single dash)
2. Language tag required — Each entry must include a language tag in backticks (e.g., `Python`, `TypeScript`). What's the primary language?
3. Concise description — The description should be one sentence, not multiple. Currently has ~4 sentences.

Here's an example of the corrected format:

• Congressional Stock Brain - Python - Free AI-powered tool for analyzing U.S. STOCK Act congressional disclosures with signal scoring and natural language query console.

Please see our contributing guidelines for the full entry format requirements.