foundationlisted

# Foundation — Foundations Skill ## Purpose Route Swift Foundation framework implementation tasks to the minimum required Foundation Knowledge Contracts. v1 scope is a deliberately curated, highest-usage subset of four topics — not an exhaustive Foundation API reference. ## Routing Load only the contracts relevant to the task. All paths relative to knowledge/foundation/. - `DateFormatter`, `ISO8601DateFormatter`, `Date.FormatStyle`, `.formatted()`, `RelativeDateTimeFormatter`, or formatter-reuse performance -> date-time-formatting.md - `Measurement`, `.converted(to:)`, `MeasurementFormatter`, `unitStyle`, or `unitOptions` -> measurement-and-unit-formatting.md - `JSONEncoder`, custom `encode(to:)`/`init(from:)` conformance, or `CodingKeys` for encoding -> codable-encoding-and-custom-conformance.md - `FileManager`, `Documents`/`Caches`/`Application Support` directories, safe file read/write, or `isExcludedFromBackup` -> filemanager-app-sandbox-directories.md Never load more than the contracts relevant to the specific question. ## Stop Conditions Stop and report if the requested topic has no matching Knowledge Contract in knowledge/foundation/ — do not guess or fall back to general knowledge. - Unit-of-measure copy wording (spelling out vs. abbreviating, spacing, capitalization once a value is already display text) — owned by `style-guide`. - Network-response `Codable` decoding (`JSONDecoder`, `DecodingError` handling for