* fix: fail fast with clear error when package manager is not installed
When PMG shims intercept a package manager that isn't installed (e.g. a
clean JAMF-provisioned laptop where PMG is set up before dev tooling),
real-binary resolution failed with a generic "unknown" error and a
bug-report link, making it look like PMG itself had crashed.
Introduce a typed BinaryNotFoundError that exits with code 127 (standard
"command not found") and maps to a new PackageManagerNotFound error code
with an actionable message instead of the Unknown classification.
Co-authored-by: Cursor <cursoragent@cursor.com>
* fix: improve missing package manager help message
Use a concise, dynamic install hint instead of explaining PMG's
PATH forwarding internals.
Co-authored-by: Cursor <cursoragent@cursor.com>
* fix: mention PATH in missing package manager help text
Covers the common case where a package manager is installed but its bin
directory is not on PATH yet (e.g. after curl | bash install).
Co-authored-by: Cursor <cursoragent@cursor.com>
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Co-authored-by: Cursor <cursoragent@cursor.com>
