docs: add ROADMAP.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ROADMAP.md

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+# BigBiggerBiggestBot — Roadmap
+
+## Immediate bugs
+- [ ] **#6** Can't save workout with only one exercise — investigate structured editor save path
+
+## Next
+- [ ] **#1** Hide "next exercise" affordance until current exercise has ≥1 set
+- [ ] **#7** Per-user workout numbering display (global ID stays as real key, just display transform)
+
+## Soon
+- [ ] **#2** Superset support in structured editor — backend already supports it; UI needs a "group with previous" toggle or drag-to-group
+- [ ] Exercise name standardization — OHP = shoulder press = military press. Aliases table.
+- [ ] **#3** Machine-to-muscle mapping — reference dataset + `/machine <id>` command. Seeded with gym80 IDs.
+
+## Later
+- [ ] **#8** Workout templates — save/load favorite workouts
+- [ ] Per-exercise history — "show me all my squat sessions"
+- [ ] Mini-app UI polish (loading states, skeleton screens)
+
+## Later later
+- [ ] Per-exercise graphs/trends
+- [ ] **#5** AI image generator describing workout (novelty)
+- [ ] Replace cloudflared — unlocks BotFather permanent URL
+
+## Feedback reference
+Raw feedback from `/feedback` command queryable via:
+
+```
+sqlite workouts.db "SELECT * FROM feedback ORDER BY created_at DESC;"
+```