Let "help <term>" fall back to list similar terms

[rolandwalker]

Description

Let "help " fall back to list similar terms when the term is not found.

• parameterize the help query
• no need to pass empty status property
• search for %keyword% if exact search fails, and report those results as a table of similar terms
• quote "keyword" in failure message

Example:

Checklist

• I added this contribution to the changelog.md file.
• I added my name to the AUTHORS file (or it's already there).
• To lint and format the code, I ran

  uv run ruff check && uv run ruff format && uv run mypy --install-types .

[github-actions]

Findings

• cur.execute(query, keyword) and cur.execute(query, f'%{keyword}%') pass a bare string as params. Many DB-API drivers treat a string as an iterable and won’t bind as a single parameter, which can raise or mis-bind depending on the driver. Use single-item tuples instead. mycli/packages/special/main.py:181 and mycli/packages/special/main.py:186.

Missing tests / edge cases

• Add tests for help <term> fallback behavior: when exact match fails it should return a “Similar terms” table. Also cover quoted/empty keywords (help "") to ensure you don’t accidentally match everything via %%. mycli/packages/special/main.py:178-191.

If you want, I can propose a small patch for the parameter binding and a minimal test.