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//! This crate embeds the open dataset **US Search Demand for Excel & Google Sheets
//! Templates — 1,008 Keywords (2026)** and exposes a small, zero-dependency Rust API to
//! query it. The source CSV is embedded in the binary via `include_str!` and parsed
//! lazily by a tiny internal parser — no allocation beyond the returned rows, no
//! external crates.
//!
//! # What the data contains
//!
//! 1,008 template-related search queries (US, English) with their estimated monthly US
//! search volume for 2026, grouped into 16 practical categories — project management,
//! bookkeeping & accounting, CRM & sales KPIs, HR & payroll scheduling, invoicing,
//! construction, real estate, weddings & events, and more. 146 keywords also carry the
//! URL of a free, no-signup spreadsheet implementation, so a keyword can be traced to
//! the actual artifact behind the demand.
//!
//! # Provenance
//!
//! The dataset was compiled in 2026 by the Data & Research Team of
//! [TableTemplates](https://tabletemplates.com/), while building an open catalog of
//! downloadable spreadsheet templates. Volumes are estimates derived from commercial
//! keyword research tooling, deduplicated and manually categorized. The dataset is
//! archived under DOI on [Zenodo](https://doi.org/10.5281/zenodo.21416251) and
//! [Harvard Dataverse](https://doi.org/10.7910/DVN/A2QIVN), and distributed under
//! CC BY 4.0.
//!
//! # Going further
//!
//! The free implementations referenced by the dataset live in the
//! [free template library](https://tabletemplates.com/free/) — every file there is a
//! direct, no-signup download. Two category indexes are useful entry points into the
//! highest-demand segments: the
//! [project management templates](https://tabletemplates.com/project-management/)
//! (largest category, 130 keywords) and the
//! [bookkeeping & accounting templates](https://tabletemplates.com/bookkeeping-accounting/)
//! (highest demand density — 45 keywords, ~24,200 combined monthly searches).
//!
//! # Example
//!
//! ```rust
//! use us_excel_template_data::catalog;
//!
//! // The whole catalog.
//! let rows = catalog::all();
//! assert_eq!(rows.len(), 1008);
//!
//! // The single highest-demand keyword.
//! let top = catalog::top(1);
//! assert_eq!(top[0].keyword, "excel accounting software");
//! assert_eq!(top[0].monthly_search_volume_us, 8250);
//!
//! // Substring search, ordered by volume.
//! let hits = catalog::search("invoice");
//! assert!(hits.iter().all(|r| r.keyword.contains("invoice")));
//!
//! // Demand aggregated by category.
//! let cats = catalog::categories();
//! assert_eq!(cats.len(), 16);
//! ```