Terminal coding agent for DeepSeek V4.

Every turn, the agent has to arbitrate between the user's intent, the project's rules, system defaults, live tool output, and stale memory. CodeWhale answers that with a written Constitution that ranks nine sources of authority explicitly (current user message above stale project instructions, live tool output above assumptions, verification above confidence), and uses V4's prefix cache to keep that Constitution almost free to reference recursively — roughly 100× cheaper per turn than a cold read — so the model spends a long session reading an open book rather than guessing from memory.

The feedback half closes itself: non-zero exit codes, type errors that rust-analyzer reports between edits, and sandbox denials come back into the context as correction vectors, so the model uses its own drift to self-correct. When you run with --model auto, CodeWhale spends a cheap Flash call at the start of each turn to route — keeping short conversations on Flash, and escalating coding, debugging, and architecture work to Pro at higher thinking depth.