fix(cli): force UTF-8 stdout/stderr on Windows to prevent UnicodeEncodeError

[rafaelfiguereod-stack]

Description

On Windows, specify crashes with UnicodeEncodeError whenever stdout/stderr
are not a UTF-8 TTY — i.e. when output is piped, redirected to a file, or the
console uses a legacy code page (e.g. cp1252). Rich renders the ASCII-art
banner and box-drawing characters, and the default Windows text encoding can't
encode them, so even specify --help and specify version abort with a
traceback instead of printing.

Repro (Windows, default code page):

> specify --help | more
... UnicodeEncodeError: 'charmap' codec can't encode characters ...

Fix: at the main() entry point, on win32 only, reconfigure
sys.stdout/sys.stderr to UTF-8 with errors="replace" so output degrades
gracefully instead of crashing.

• No-op on POSIX.
• Guarded by try/except (AttributeError, ValueError, OSError) so unusual
  stream setups (already-wrapped/detached streams) can never make things worse.
• Placed at the CLI entry point, so importing specify_cli as a library does
  not mutate global streams.

if sys.platform == "win32":
    for _stream in (sys.stdout, sys.stderr):
        try:
            _stream.reconfigure(encoding="utf-8", errors="replace")
        except (AttributeError, ValueError, OSError):
            pass

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (N/A — change only affects console stream encoding)

On Windows 11, cp1252 console, without PYTHONUTF8/PYTHONIOENCODING:

• specify --help piped → renders banner + option boxes, exit 0 (was: UnicodeEncodeError).
• specify version > out.txt → renders correctly, exit 0 (was: traceback).

Full suite: 3217 passed, 119 skipped. The 11 failures are pre-existing and
unrelated to this change — os.symlink() calls in test setup raise
OSError [WinError 1314] because the Windows host lacks symlink-create
privilege; they pass on POSIX / elevated Windows.

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

Diagnosed, implemented, and verified with Claude (Claude Code); reviewed before
submission. Reflected in the commit's Co-Authored-By trailer.

[Copilot]

Pull request overview

This PR prevents UnicodeEncodeError crashes on Windows when specify output is redirected/piped or when the console uses a non‑UTF‑8 code page by reconfiguring sys.stdout/sys.stderr to UTF‑8 at the CLI entry point.

Changes:

• On Windows (sys.platform == "win32"), call reconfigure(encoding="utf-8", errors="replace") on sys.stdout and sys.stderr before invoking the Typer app.
• Guard stream reconfiguration with try/except so unusual stream setups don’t introduce new failures.

Show a summary per file

File	Description
src/specify_cli/__init__.py	Reconfigures stdout/stderr to UTF‑8 on Windows at main() startup to avoid UnicodeEncodeError when printing Rich UI output.

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