v3.0.1 — Fewer steps for common questions, and recorded demos

Fewer steps for the questions people ask most. Recording the README's demo sessions showed where the agent had to work around the skill; each of those places is now one command. See CHANGELOG.md.

• competitions shows each competition's metric and the last day to join (or "submissions closed").
• brief quotes the start of the evaluation page and lists the host's timeline, and takes several competitions at once.
• writeup takes several ids or URLs, one block each, and cuts a body at 8,000 characters with a note.
• solutions says which leaderboard its scores come from, and --preview shows how each writeup starts.
• The submit dry run checks the file against the sample submission itself.
• KAGGLE_SKILL_HIDE_ACCOUNT=1 leaves your entries and ranks out of listings and briefs, for screen sharing.
• The README's demos are four recorded Claude Code sessions, each checked against what the commands printed.

Verification

• 1420 offline tests pass on Python 3.11, 3.12, 3.13 and 3.14.
• 169 read-only live tests pass against Kaggle CLI 2.2.4 and the MCP server.