fix: clarify skipped value truncation

[tomatotomata]

Summary

Closes #2629.

• make truncated skipped-value reprs visibly truncated and report their full repr length
• keep the existing ten-row listing cap
• pin the cap with a negative assertion and tighten the repr regression test

The optional translate-types symmetry test is intentionally left out so this PR stays focused on the two concrete follow-ups.

Validation

• python -m compileall -q src/wren/utils_cli.py
• direct _report_skipped helper checks for the marker, full length, and row cap
• git diff --check

The repository test dependencies are not installed in this sparse checkout (sqlglot and the locked uv environment are unavailable), so the full pytest and Ruff commands could not run locally.

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