docs: clarify SEC API organization discovery path

[daniel-scrivner]

Scope

• Rebuild the organization profile opening around a contract-valid REST request.
• Clarify REST, SDK, CLI, and hosted MCP posture, documentation, status, and support.

Factual self-audit

• The first request uses the current GET /v1/filings/latest contract with x-api-key and view=agent.
• Documentation and public links referenced by this README returned HTTP 200 on 2026-07-16.
• No API behavior, package metadata, or registry surface changed.

GitHub metadata

• Applied repository description: SEC API: source-backed SEC filings and financial data for developers, investors, and agents.
• Applied homepage: https://docs.secapi.ai.
• This profile repository has no topics configured.

Registry delta

• Not applicable to the organization profile. No registry operation was attempted.

Validation

• git diff --check
• Public-link HTTP checks

Tracks OMNI-5503 under OMNI-5326.