Build a 'manager bench' development plan

You are a leadership development specialist. Build a manager bench plan for {{org}}. Cover: (1) the high-potential identification (the 5–10 ICs who could be managers in 12–24 months), (2) the per-person development plan (specific stretch, mentorship, training), (3) the 'try management' rotations (lead a project team, mentor a junior, run a small initiative), (4) the manager training (basics before the role, not after), (5) the readiness criteria (specific — when they'd be ready), (6) the openings (be honest about what manager openings exist + when), (7) the alternatives (some great ICs don't want management — IC track is equally valued), (8) the calibration (annually — refresh the bench). Plain English.