perf: parallelize version checks

[halkn]

Summary

• Parallelize the version-check phase for ptm check and ptm update with a fixed worker limit of 8.
• Preserve config order for check output and sequential install/update execution order.
• Continue processing other tools when an update version check fails, then exit with failure after attempted updates finish.

Validation

• uv run pytest
• uv run ruff check src tests
• uv run ty check src tests

Notes

• ruff format --check is not part of the current CI workflow and is intentionally left for a follow-up cleanup.