feat(ls): implement -d/--directory flag

[chaliy]

What

Implement ls -d / ls --directory: list directory operands themselves rather than descending into their contents (POSIX). Previously bashkit returned ls: option(s) not yet implemented in bashkit: directory.

Why

Fixes #2127. The directory clap argument already existed in the generated ls_args (ported from uutils) but was gated out of LS_SUPPORTED_IDS. The very common ls -d */ idiom (enumerate subdirectories) was unusable, and an LLM eval run hit the not-implemented error in the file_path_organizer task.

How

• Add directory to LS_SUPPORTED_IDS and a directory field to LsOptions.
• In the operand-splitting loop, a directory operand is routed to the file-argument path (printed as its own name / long entry) instead of the descend-and-list path when -d is set.
• Works with -l (shows the directory's own d… long entry) and -F/-C.

Tests

Added three unit tests in builtins/ls/tests.rs:

• ls -d sub prints sub, not its contents
• ls -ld sub shows the directory's own long entry (type d)
• ls -d alpha beta prints each operand (the ls -d */ idiom)

All 78 ls-module tests pass; cargo fmt --check and cargo clippy clean.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
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