Fix UnicodeEncodeError in gtn config list on cp1252 consoles

[ClaraOswald076]

Summary

Fixes #5470.

gtn config list printed its header containing U+27F6 (⟶, long rightwards
arrow) and then crashed with UnicodeEncodeError: 'charmap' codec can't encode character '\u27f6' on any Windows console/pipe whose stdout encoding is the
legacy cp1252 code page. This replaces that one character with the ASCII arrow
->, so the command works on every console.

Changes

• src/griptape_nodes/cli/commands/config.py: ⟶ -> -> in the
  _list_user_configs() header, plus a comment explaining why the character
  must stay ASCII
• tests/unit/cli/commands/test_config.py (new): regression test that swaps
  the shared console for one writing through a strict-cp1252 BytesIO wrapper
  and asserts _list_user_configs() completes without raising

Test evidence

Windows, Python 3.12.13, pytest 9.1.1.

Before (upstream code with the regression test applied, via git stash):

C:\...\Lib\encodings\cp1252.py:19: UnicodeEncodeError
FAILED tests/unit/cli/commands/test_config.py::TestListUserConfigs::test_lists_user_configs_on_cp1252_stdout
======================== 1 failed, 1 warning in 13.89s ========================

End-to-end repro on upstream code (cp1252 stdout):

UnicodeEncodeError: 'charmap' codec can't encode character '\u27f6' in position 1: character maps to <undefined>

After:

tests/unit/cli/commands/test_config.py::TestListUserConfigs::test_lists_user_configs_on_cp1252_stdout PASSED
======================== 1 passed, 1 warning in 7.25s =========================

pytest tests/unit/cli -q: main baseline 4 failed, 15 passed vs this branch
4 failed, 16 passed — the 4 failures are pre-existing network-dependent
doctor/websocket tests, unrelated to this change; no regressions.

Note: src/griptape_nodes/cli/commands/libraries.py lines 53/56 use ✓/→/✗,
which have the same cp1252 failure mode. Left out of this PR to keep it scoped
to the reported command; happy to follow up.

[collindutter]

Thank you!

[collindutter]

@ClaraOswald076 it looks like some checks are failing, could you please get them passing? Otherwise PR is good with me!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[ClaraOswald076]

Fixed the lint and type-check failures in 26571df — the test now passes ruff (annotations) and pyright (captures console output via an explicit BytesIO instead of reaching into TextIOWrapper.buffer). The remaining version-ahead failure is the release-bump policy check (branch is at 0.100.0 while the latest release is v0.101.0) — it should clear once the bump lands on main, same as on other PRs.