This manuscript proposes BCL-Aegis, a multi-layer symbolic-steganographic cipher language designed as a conceptual and executable framework for three practical modes: daily human-use encoding, algorithmic programmable encryption, and an advanced agent-oriented mode for hidden text transport inside ordinary-looking cover text. The proposed system combines a visible symbolic layer, an invisible zero-width carrier layer, dynamic key derivation, position-dependent masking, block-oriented metadata, decoy/noise capacity, and integrity verification. The implementation included here is deliberately framed as a research prototype, not as a replacement for standardized cryptographic systems such as AES, authenticated encryption modes, or ChaCha20-Poly1305. Its primary contribution is architectural: it treats encryption not only as ciphertext generation but as a language-like layered text system in which visible characters, invisible carriers, symbols, mode markers, and algorithmic keys jointly define a structured communication medium. A Python prototype was executed locally and demonstrated successful encryption, invisible embedding, recovery, and wrong-key rejection through an integrity check. Security limitations, ethical boundaries, and validation routes are discussed.