Hide legacy JetBrains helper command names

[cbusillo]

Summary

• Prefer self-descriptive JetBrains helper commands in skill docs, CLI help, JSON output, hints, and UNKNOWN logs
• Keep legacy helper command inputs as compatibility aliases without surfacing them in normal output
• Add regression coverage for preferred help output, alias normalization, emitted command names, and UNKNOWN ledger command names

Validation

• uv run jetbrains-inspection/tests/test_jb_inspect.py
• uv run jetbrains-inspection/scripts/jb-inspect.py --help
• uv run jetbrains-inspection/scripts/jb-inspect.py run --help
• uv run jetbrains-inspection/scripts/jb-inspect.py --json route --repo /tmp/definitely-not-open

Companion plugin PR: cbusillo/jetbrains-inspection-api#111