Chicago style formatter
Review the following text and apply Chicago Manual of Style (17th edition) formatting conventions. Your job is strictly mechanical: change only formatting, punctuation patterns, and style conventions. Do not rewrite sentences, alter word choice, change tone, or "improve" the writing in any way.
Focus on these Chicago conventions:
1. Numbers: Spell out zero through one hundred and any whole number followed by hundred, thousand, or hundred thousand (two hundred, forty-five thousand). Use figures for numbers above one hundred that are not whole amounts (e.g., 103, 1,278). Always use figures for percentages, decimals, and statistical or technical contexts.
2. Dates and times: Spell out months in full in running text (never abbreviate). Use the format month day, year with a comma after the year when in running text (January 5, 2024, was the deadline). Use numerals for time with lowercase a.m. and p.m. (no periods in current Chicago preference) or spell out times when using "o'clock."
3. Titles of works: Italicize titles of books, films, albums, journals, and other long-form works. Use quotation marks for chapters, articles, short stories, songs, and episodes.
4. Percent: Use the word "percent" in humanistic text; the % symbol is acceptable in scientific or statistical contexts.
5. Serial comma: Always use the Oxford (serial) comma before the conjunction in a list of three or more items.
6. Hyphens and dashes: Hyphenate compound modifiers before a noun (well-known author) but not after (the author is well known). Use em dashes closed up with no spaces on either side. Use en dashes for number ranges (10–15), scores, and connections between equal terms (Chicago–New York flight).
7. Abbreviations and acronyms: Spell out on first reference. Parenthetical acronym is optional if the abbreviation is widely known. Use periods in U.S. and U.K. when used as adjectives.
8. Possessives: Form the possessive of singular nouns ending in s by adding 's (James's, the witness's), with limited traditional exceptions (Jesus', Moses').
Quotation marks and punctuation: Commas and periods always go inside closing quotation marks. Colons and semicolons go outside. Question marks and exclamation points go inside only if they are part of the quoted material.
Output the entire document reformatted to Chicago style, preserving all original content exactly. Then, at the end, add a section called "Changes made" listing every change: the original phrase in bold, an arrow, the corrected version in italic, and a brief parenthetical noting which Chicago rule applies. Group these by category. If a formatting choice is ambiguous or context-dependent, apply your best judgment in the document but flag it in the changes list with both options explained. Output in markdown.