feat: add uvx rust trial helper

[rysweet]

Summary

• add amplihack-rust-trial, an opt-in console script for trying the bundled Rust CLI without replacing the current amplihack install
• run the Rust binary under an isolated trial home so state stays out of the user's real ~/.claude tree
• document the new uvx flow in the README and cover the helper with focused tests

Validation

• uv run ruff check src/amplihack/rust_trial.py tests/test_rust_trial.py
• /home/azureuser/src/amploxy/.venv/bin/pytest tests/test_rust_trial.py -q
• AMPLIHACK_RUST_TRIAL_BINARY=/home/azureuser/src/amplihack-rs/target/debug/amplihack uvx --from . amplihack-rust-trial --trial-home /tmp/amplihack-rust-e2e-uvx --help

[github-actions]

🤖 Auto-fixed version bump

The version in pyproject.toml has been automatically bumped to the next patch version.

If you need a minor or major version bump instead, please update pyproject.toml manually and push the change.