coderai-oci (in-image): append ${CODERAI_EXTRA_ARGS} to the server argv in both
exec paths. supervisord runs a fixed command, so arbitrary server flags arrive
via this env var rather than argv. (Takes effect after an image rebuild.)

run_oci.sh: --coderai-arg ARG (repeatable, one token each) and --coderai-args
"STR" build CODERAI_EXTRA_ARGS and inject it with -e; new cdr-args banner line.
`--` still goes to the container engine, not coderai.

Docs (AI.PROMPT, dist-bundle README.md/.txt) updated accordingly.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>