feat(solo/stdlib): fs_list_dir(path) -> Array<String>

[hyperpolymath]

Closes the last untracked Solo stdlib gap (the one flagged on #45 throughout the Phase-2 work).

What

fs_list_dir(path) -> Array<String> — entry names (not full paths) in path, sorted for deterministic tooling output; errors cleanly if path isn't a readable directory. Registered with the other fs_* builtins; same shape as fs_exists.

Unblocks audit/scan tooling (the original idaptik-port scaffold-audit use case): combined with fs_exists/fs_read_file it's enough to walk a tree.

Validation

• examples/fs_list_dir.my lists examples/ sorted.
• test_eval_fs_list_dir — self-contained (builds a dir with fs_create_dir_all/fs_write_file, lists it, asserts sorted a.txt,b.txt). Full suite 20 passed, 0 failed.
• clippy-clean; new code rustfmt-clean (pre-existing stdlib.rs drift untouched, consistent with feat(solo/stdlib): string-keyed Map/dict builtins #49/feat(solo/stdlib): json_parse / json_stringify (+ fix string-literal escapes) #53/feat(solo/stdlib): date_today() -> ISO YYYY-MM-DD (UTC) #54).

Refs #55

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 35 issues detected

Severity	Count
🔴 Critical	6
🟠 High	11
🟡 Medium	18

⚠️ Action Required: Critical security issues found!

View findings

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