v3.14.9 — bump claudebox -> v2.0.13, pibox-zai -> v0.14.0

Restores the claudebox v2 API-mode migration that had drifted out of
docker-compose.yml (CLAUDEBOX_API_MODE env vars, /home/aicode/.aicodebox
+ /workspace volume paths, /healthz healthcheck), enables claudebox's
MCP server (CLAUDEBOX_MCP_MODE), and fixes a file-ops 500 caused by a
root-owned workspace host dir. Bumps both images to their current tags:

  psyb0t/claudebox:v1.14.0-minimal -> v2.0.13
  psyb0t/pibox:v0.12.0 -> v0.14.0

Full tests/test_claudebox.sh suite verified 4/4 passing against the
recreated containers.