Fixed incorrect bd dep documentation in prime.go, cursor.go, and aider.go - Added missing 'add' subcommand (was 'bd dep <from> <to>', now 'bd dep add <issue> <depends-on>') - Corrected semantics (docs claimed 'from blocks to' but actual behavior is 'issue depends on depends-on') This fixes AI agents and users consistently creating dependencies in the wrong direction. Co-authored-by: jflam <jflam@users.noreply.github.com>