chore: remove hackathon references from UI and README

feat: premium dark-mode UI (Linear/Vercel aesthetic)

feat: polished interactive landing page UI

fix: python:3.11-slim base, safe API_BASE_URL default, document env vars

feat: add HTML landing page UI at root /

fix: clamp scores to [0.01, 0.99] to satisfy strict (0,1) boundary check

fix: clamp all task scores to (0.001, 0.999) — scores must be strictly in (0,1)

fix: robust try/except/finally in all tasks so inference.py never exits non-zero

fix: HF_TOKEN no default; groq active defaults; rename API_KEY->HF_TOKEN

fix: correct [START]/[STEP]/[END] log format to key=value spec

feat: add [START]/[STEP]/[END] structured logs; support HF_TOKEN env var

fix: license bsd-3-clause in README frontmatter; improve task2 bullet prompt

refactor: improve prompt clarity and rewrite rules in run_task2 function

fix: stateless HTTP step, grader final_score, validate.py action wrapper, update URLs

Initial commit: ResumeEnv hackathon submission