pm search <exact-id> does not return the matching item #268

Bug description

Searching for an item by its exact ID (e.g. pm search pm-fk49 or pm search fk49) returns zero results. Users must use pm get pm-fk49 instead. Title-based search works as expected.

Reproduction

pm search pm-fk49
pm search fk49
pm search "Game Engine & Core Architecture"

Expected behavior

Exact ID search should return the matching item, or at minimum document that ID search is not supported and suggest pm get.

Actual behavior

No results for ID queries.

Impact

Breaks common scripting and quick lookup workflows where the user already knows the ID.

Suggested fix

Add an ID prefix match in pm search (exact and partial), or expose a dedicated pm lookup <id> command.