//! Product-reliability integration suite (CLAUDE.md product-integration
//! contract). The bar: a customer's experience CANNOT be bad, under any setup.
//!
//! Structure:
//! * `harness` - the hostile-env command driver + shared invariant assertions.
//! * `surface_*` - matrices fanning every subcommand across every [`Profile`].
//! Each `(subcommand × profile)` is its OWN `#[test]` (a nested module path
//! like `reliability::surface_help::scan::no_home::case`), so a failure names
//! the exact subcommand and environment that broke. This is the sanctioned
//! matrix: every axis flips a different runtime branch, every cell asserts a
//! real invariant through the real binary.
//! * the remaining files are hand-authored deep tests for specific defect
//! classes (installer recoverability, exit-code/doc contract, scan
//! robustness, output-format stability).
//!
//! [`Profile`]: harness::Profile
// Subcommand × profile matrices.
// Hand-authored deep defect-class suites.