[ult666666]

Summary

• Removed the docs/superpowers/ AI planning notes (nothing links to them) and added the folder to .gitignore.
• README: the examples section now says the walk-forward script writes CSVs rather than a figure; the walk-forward paragraph reads as a sentence and matches the file's one-line paragraphs; dropped a CI trivia sentence and a repeated disclaimer; the roadmap now says what "execution lag" means (an engine option to fill after the signal close) so it no longer reads as contradicting the walk-forward example; replaced the one em dash in the tagline.
• .gitignore now covers /prices.csv and /frontier.png, which the README's CLI examples write when run from the repository root.
• CHANGELOG: added an Unreleased section for the walk-forward example and the release workflow. A compare of v0.1.0...main shows no src/ changes, so the package itself is unchanged.

Verification

• Ran the CI steps locally: uv sync --locked --all-extras, ruff check, ruff format --check, mypy, and pytest --doctest-glob=README.md --cov=quantkit --cov-fail-under=90 (345 passed, 99.5% coverage).
• CLI smoke commands and the three figure scripts run cleanly (figures restored afterwards).
• Confirmed prices.csv, frontier.png and new files under docs/superpowers/ are ignored.

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