Add deterministic multi-key sorting to fd

Normalized profile

What this task asks for

Add repeatable multi-key sorting controls to fd output with deterministic tie-breaking and seeded random order. If all keys tie, output must still be deterministic via path tie-breaks. All sorting modifiers require `--sort`: `--reverse`, `--dirs-first`, `--files-first`, `--sort-case-sensitive`, `--sort-missing-last`, and `--sort-natural`. `--sort-missing-last` places entries with missing optional values at the end. Without `--sort-missing-last`, missing values sort before present values. For `--sort size`, size is only defined for regular files. Directories, symlinks, and other non-file entries must be treated as missing size values. With `--sort` + `--max-results`, fd must sort first and apply the limit after sorting (and after reverse if present). Sorting must be deterministic across repeated runs and must not depend on traversal order.