Clean-Space pass: drop self-test, legacy unused handler, BISECT_MINIMAL branch, duplicate banner PNG, stale comments

Default LLM-call tracing to ON — writes to ./traces unless ORACLES_TRACE_DISABLE=1

run.sh: print clear localhost:7860 banner — 0.0.0.0 fails in Chrome

Default --keep-warm and add --stop-on-exit + safer launch for Gradio 4/5/6

Add ORACLES_VISUAL_MODE toggle — lean default, full enabled via --full or env var

Initial commit — The Apprentice for Build Small