docs: add CMED-PP BikeErg 8-week training block

[tomaszwojcikowski]

Summary

• add a complete no-running, BikeErg-based eight-week conditioning and strength program
• define weekly cardio progression, benchmarks, strength sessions, deloads, progression, fatigue rules, and session tracking
• provide rower and air-bike substitution guidance
• add Bulgarian split squats to Friday leg day (warm-up and accessory block)
• link the program from the repository knowledge base

Verification

• confirmed all prescribed sessions remain below 60 minutes
• checked interval-duration calculations and corrected total-session estimates
• verified the README link resolves and the Markdown diff has no whitespace errors