Pin websocket directly at the canonical tangled.org v0.1.8 source and bump zat to its current main (which is now on the same v0.1.8 websocket), so the dependency graph resolves to exactly one websocket version. This removes the prior mixed graph (direct 0.1.2 + transitive zat->0.1.2). zig build && zig build test green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>