v5.1.3 — CI fix for Windows runner test portability

v5.1.3 (PATCH)

Fixes

• CI Windows failure in tests/test_category9.py::test_terminal_blocked_patterns:
  on a fresh runner, run_terminal_command fell back to a workspace dir that might not exist
  (NotADirectoryError 267). The test is now deterministic — it pins FORGE_WORKSPACE to a temp
  path via monkeypatch. No production behaviour changed.

Test status

• Full suite (Windows/Linux): 1132 passed, 13 skipped (llama.cpp E2E + POSIX-only), 0 failed.
• New regression guard in tests/test_grp2_fixes.py covers the QA defects fixed in v5.1.1–v5.1.2.

Compatibility

• No breaking changes, no schema/data migration.