fix: make csv-read-options.py example self-contained (#1728)

[dedsec-terminal]

Which issue does this PR close?

Closes #1728.

Rationale for this change

examples/csv-read-options.py failed when executed because it attempted to read data.csv and data.csv.gz which do not exist in the repository.

What changes are included in this PR?

• Made examples/csv-read-options.py self-contained by generating small temporary CSV and gzipped CSV files in a tempfile.TemporaryDirectory().
• Added .show() calls to display example DataFrame outputs.

Are there any user-facing changes?

No breaking changes; fixes example execution so it is runnable out of the box.

[Copilot]

🟡 Changes recommended

The delimiter mismatch affects example correctness, and Example 3 does not execute.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Fixes examples/csv-read-options.py by making it runnable with generated temporary CSV and gzip inputs.

Changes:

• Generates temporary CSV fixtures.
• Updates reads and registrations to use them.
• Adds output display calls.

File summaries

File	Summary
examples/csv-read-options.py	Self-contained CSV options demonstrations. Moderate finding (1 vote): delimiter does not match the generated fixture. Nit (3 votes): Example 3 needs a terminal call such as df.show().

Review details

Suppressed comments (1)

examples/csv-read-options.py:64

• The generated fixture is comma-separated, but this example configures | as the delimiter. It therefore reads each row as one field instead of demonstrating a valid custom-delimiter CSV; use a pipe-delimited fixture for this example or change the delimiter to match the fixture.

        .with_delimiter("|")

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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