docs(pgpm): list ls in top-level help

[pyramation]

Summary

pgpm ls (#1841) works and has its own --help, but the hand-maintained usageText in pgpm/cli/src/utils/display.ts never listed it, so pgpm --help didn't advertise the command. Adds the one line under "Project Management".

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Requested by: @pyramation

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[tenki-reviewer]

Review complete. No issues found — approved ✅.

---

This PR makes a small change to pgpm/cli/src/utils/display.ts, the CLI's shared display/help-text helper. The change is limited to output/formatting internals and does not alter command routing, argument parsing, or the migration engine. No correctness, concurrency, security, data-handling, or performance regressions were found across the correctness, performance, CLI-domain, holistic, and sweep review passes.

Files	Change
pgpm/cli/src/utils/display.ts	Adjusts the display/help output behavior for CLI commands.

_{Reviewed commit: 38ddf06}