fix: constrain custom wordlist paths

[dk3yyyy]

Summary

• restrict custom wordlist names to a bounded ASCII allowlist
• prevent traversal, per-file symlink escapes, and symlinked wordlist-directory redirects
• preserve valid one-to-64-character names, including names beginning with _ or -
• add traversal, symlink, boundary, invalid-name, and round-trip regression coverage

Verification

• uv run pytest -q — 44 passed
• uv run python -m py_compile main.py web.py
• git diff --check
• independent security review completed; blocking name-contract finding fixed and symlink-directory hardening added

Remaining limitation

A same-user attacker able to race filesystem entries between validation and open could still attempt a TOCTOU swap. Fully descriptor-relative O_NOFOLLOW handling would be platform-specific; the current change closes the direct traversal and stable symlink escape paths without broad filesystem refactoring.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6421e720-851f-4de6-9bf6-678a3d4d2686

📥 Commits

Reviewing files that changed from the base of the PR and between 7234dd3 and d29e540.

📒 Files selected for processing (2)

• main.py
• tests/test_main.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/validate-wordlist-paths

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