* coderai-docker (run_oci.sh): new --tool-arg TOOL VAL (one token) and
  --tool-args TOOL STR (whitespace string), repeatable, for video-editor |
  videogen | township | parler. They accumulate into CODERAI_<TOOL>_ARGS env vars
  that supervisord appends to each tool's command line. Documented in --help
  (plus the --map dir-or-file note and bring-your-config examples), and shown on
  the startup banner (tool-args:).
* entrypoint: default+export the four CODERAI_*_ARGS (empty) so supervisord's
  %(ENV_...)s never fails on an undefined var; pre-create /cache/video_editor/sessions.
* supervisord: append %(ENV_CODERAI_*_ARGS)s to all four tool launchers; the video
  editor now runs with --session --session-dir /cache/video_editor/sessions so
  editor-state recovery is ON by default and persists on the cache volume.
* video_editor.py: new --session-dir to place session state/assets at a
  persistent/mapped path (defaults to ~/.cache/... when omitted).

Bump version to 0.1.6.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RdMufYvtTbtGDWsiZVoXce