feat: add crypto, session, sigil, and node packages
Add new packages for cryptographic operations, session management,
and I/O handling:
- pkg/crypt/chachapoly: ChaCha20-Poly1305 AEAD encryption
- pkg/crypt/lthn: Lethean-specific key derivation and encryption
- pkg/crypt/rsa: RSA key generation, encryption, and signing
- pkg/io/node: CryptoNote node I/O and protocol handling
- pkg/io/sigil: Cryptographic sigil generation and verification
- pkg/session: Session parsing, HTML rendering, search, and video
- internal/cmd/forge: Forgejo auth status command
- internal/cmd/session: Session management CLI command
Also gitignore build artifacts (bugseti binary, i18n-validate).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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