A daily replay challenge with a shareable result card

[iamsaquib8]

What

Roadmap item: one shared historical replay per day (same stock and window for everyone, the future hidden), scored on the simulator's risk-adjusted score, with a shareable image card. Wordle-style daily puzzles spread through screenshots, which suits a CLI that is hard to show off otherwise.

Design

• stockwise practice daily: picks the day's challenge deterministically from the date (a seeded choice from a curated list of NIFTY/US windows), so no server is needed.
• At the end, print the score and write a PNG/SVG card (assets/sim-card.svg is a starting point) with the score, the hidden period revealed, and a short share line — no portfolio data.
• --share-text prints a plain-text version for X/Reddit.

Done when

• Two users on the same date get the same challenge.
• The card renders without fonts installed (embed or outline them).
• Tests cover the seeded choice and the scoring.

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Moved from issue #244 to keep the issue tracker for scheduled work. Upvote or comment if you would use this; ideas with demand go back on the roadmap.