fix: validate attached redirection paths

[hiSandog]

Summary

• strip attached shell redirection operators before extracting path candidates
• validate redirection targets like <../file and 2>../file against workspace scope
• add regression coverage for attached redirection targets

Validation

• python3 -m unittest tests.test_security_scope -q
• python3 -m compileall -q src/path_scope.py tests/test_security_scope.py
• git diff --check -- src/path_scope.py tests/test_security_scope.py

[1716775457damn]

Good catch on the redirection bypass. Stripping shell redirects before path extraction is the right fix. One minor suggestion: confirm this handles no-space-after-redirect like 2>../file (valid in bash). Otherwise LGTM.

[1716775457damn]

Good catch on the attached redirection operators — <../file and 2>../file are real edge cases that could slip through naive path validation. The regression tests look solid. One suggestion: consider also covering >> (append) and &> (combined stdout+stderr) in the stripping logic, since those are also valid shell redirection syntax that could be abused similarly.