When invoked as the pnpm/pnpx shim, walk up from cwd looking for
pnpm-workspace.yaml (or a pnpm field in package.json) and use its
minimumReleaseAge and minimumReleaseAgeExclude as the floor and
exclusion list. Existing CLI args, env vars, and ~/.safe-chain/config.json
still override, so the project's pnpm config can act as a single source
of truth without forcing users to duplicate settings across two systems.
Fixes#460
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
