Add filtering options to `commit list` (`--limit`, `--since`, `--search`)

[AlephNotation]

Feature request

vers commit list dumps all commits with no filtering. With 133+ commits, the output is a wall of UUIDs.

Suggestion

vers commit list --limit 10                    # most recent N
vers commit list --since 2026-04-07            # created after date
vers commit list --search "golden"             # filter by name substring
vers commit list -q                            # just commit IDs (for scripting)

Note: -q may already work (the README shows it), but --limit, --since, and --search would be the most impactful additions.

Impact

Agent workflows that manage commits programmatically need to find specific commits without downloading the full list every time.