Complete and polish classification section introduction

[Copilot]

• Review and understand current classification.qmd content
• Add comprehensive introduction explaining classification in epidemiology
• Improve mathematical notation and clarity
• Add proper context and definitions for sensitivity, specificity, and predictive values
• Restructure content for better pedagogical flow
• Add explanatory text between mathematical steps
• Review and validate changes
• Resolve merge conflict with classification branch
• Add newlines after each sentence of prose for better source readability
• Replace standard notation with custom macros (\pmf for probabilities, \cd for cdot)

Applied custom macros throughout the document: replaced \Pr(...) with \pmf{...} and \cdot with \cd for consistency with the book's notation conventions.

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[d-morrison]

@copilot fix conflict

[Copilot]

@copilot fix conflict

Merge conflict resolved in commit 9c4b4d2. The classification branch contained minor typo fixes to the original content, but our polished version already addresses these improvements and provides a comprehensive pedagogical treatment of diagnostic test interpretation using Bayes' theorem.

[d-morrison]

@copilot add a newline after each sentence of prose

[Copilot]

@copilot add a newline after each sentence of prose

Added newlines after each sentence of prose and replaced standard notation with custom macros (\pmf for probabilities and \cd for multiplication) in commit 4f30f9b.