Initial repo skeleton with pyproject.toml and project guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/soosef/__init__.py

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+"""
+SooSeF — Soo Security Fieldkit
+
+Offline-first security toolkit for journalists, NGOs, and at-risk organizations.
+Combines Stegasoo (steganography) and Verisoo (provenance attestation) with
+field-hardened security features.
+
+Part of the Soo Suite:
+- Stegasoo: hide encrypted messages in media
+- Verisoo: prove image provenance and authenticity
+- SooSeF: unified fieldkit with killswitch, dead man's switch, and key management
+"""
+
+__version__ = "0.1.0"