Update installation tests to reference @kilocode/cli instead of
opencode-ai for npm/bun/pnpm version lookup assertions. Adjust
session schema decoding test to omit the patch field from
SummaryFileDiff, matching the kilo-specific schema shape.
Moves effect logging, observability, runtime utilities, flags, installation
version info, and process utilities from opencode to core package. This
enables better code sharing across packages and establishes core as the
single source of truth for foundational utilities.
All internal imports updated to use @opencode-ai/core paths for consistency.
Mark IJbema