Phase 2: Analytics - PR tracking, volume analysis, progression

[gricha]

Summary

• workout pr - Personal records with estimated 1RM calculation
• workout volume - Training volume analysis (weekly/monthly, by muscle/exercise)
• workout progression <exercise> - Track progression over time with e1RM trends

Commands

PRs

workout pr                    # all PRs
workout pr bench-press        # specific exercise
workout pr --muscle chest     # filter by muscle
workout pr --json             # JSON output

Volume

workout volume --week         # this week
workout volume --month        # this month  
workout volume --last-weeks 8 # last 8 weeks
workout volume --by muscle    # group by muscle
workout volume --by exercise  # group by exercise

Progression

workout progression bench-press          # show trend
workout progression bench-press --last 20 # last 20 sessions
workout progression bench-press --json   # JSON output

Test Plan

• 93 tests passing (14 new analytics tests)
• bun run validate passes