readme: surface demo video + model note at top

submission: Field Notes badge + blog link

submission: link social post

submission: link demo video (mp4)

add demo video (mp4)

submission: link shared agent-traces dataset (Sharing is Caring)

submission: canonical tags + submission section (video/social/traces, Tiny Titan)

submission: add track/sponsor/achievement tags

feat: Open Trace — downloadable JSON pipeline trace per run

robustness: friendly message when no car listing is detected

docs: add demo GIF

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docs: correct architecture (single model call; deterministic pricing/advice)

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initial commit