feat: replace wk1/wk4 targets with 6→8→10→12 rep ladder progression

Simplifies the progression model to a universal rep ladder: every exercise
follows 6→8→10→12 reps at current weight, then +5 lbs and reset to 6.
Replaces per-user wk1/wk4 rep and weight targets with a single
starting_weight field.

- Add Alembic migration to drop wk1_reps/wk4_reps/wk1_weight/wk4_weight,
  add starting_weight (migrated from wk1_weight)
- Run Alembic migrations on app startup instead of create_all, with
  auto-detection and stamping for legacy databases
- Include alembic/ and alembic.ini in Docker image
- Rewrite progression_service.get_suggestion() with ladder logic:
  climb, hold, weight_increase, hold_at_top, deload
- Replace wk1/wk4 grid in exercise cards with rep ladder progress bar
- Add color-coded progression badges by type
- Change weight log input from text to number with pre-filled suggestion
- Normalize weight input in routes (0→BW, bare number→N lbs)
- Remove schedule page (route, template, nav link, tests)
- Simplify user_programs.yaml from 4 fields to 1 per exercise
- Update all tests for new schema and progression logic

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/routes/logging.py

@@ -22,6 +22,23 @@ logger = structlog.get_logger(__name__)
 router = APIRouter(prefix="/log", tags=["logging"])
 
 
+def _normalize_weight(raw: str) -> str:
+    """Convert numeric weight input to display format.
+
+    '0' or '' → 'BW', bare number → '{n} lbs', already formatted → pass through.
+    """
+    raw = raw.strip()
+    if not raw or raw == "0":
+        return "BW"
+    try:
+        num = float(raw)
+        if num == int(num):
+            return f"{int(num)} lbs"
+        return f"{num} lbs"
+    except ValueError:
+        return raw
+
+
 @router.post("", response_class=HTMLResponse)
 async def log_set(
     request: Request,
@@ -38,7 +55,7 @@ async def log_set(
     workout_day_id = int(form.get("workout_day_id", 0))
     set_number = int(form.get("set_number", 1))
     reps = int(form.get("reps", 0))
-    weight = form.get("weight", "")
+    weight = _normalize_weight(form.get("weight", ""))
     felt_easy = form.get("felt_easy") == "on"
 
     # Get or create today's session
@@ -89,7 +106,7 @@ async def edit_log(
     log_service.update_log(
         log_id,
         reps_completed=int(form.get("reps", 0)),
-        weight_used=form.get("weight", ""),
+        weight_used=_normalize_weight(form.get("weight", "")),
         felt_easy=form.get("felt_easy") == "on",
         notes=form.get("notes"),
     )

app/routes/schedule.py

@@ -1,77 +0,0 @@
-"""4-week schedule calendar routes.
-
-Displays a calendar view showing which workout day maps to which date.
-"""
-
-from datetime import date, timedelta
-
-import structlog
-from fastapi import APIRouter, Depends, Request
-from fastapi.responses import HTMLResponse
-from sqlmodel import Session
-
-from app.database import get_db_session
-from app.models.user import User
-from app.services.exercise_service import ExerciseService
-from app.services.workout_session_service import WorkoutSessionService
-from app.utils.auth import require_active_profile
-
-logger = structlog.get_logger(__name__)
-
-router = APIRouter(prefix="/schedule", tags=["schedule"])
-
-
-@router.get("", response_class=HTMLResponse)
-async def schedule_view(
-    request: Request,
-    session: Session = Depends(get_db_session),
-    profile: User = Depends(require_active_profile),
-):
-    """Render the 4-week schedule calendar.
-
-    Shows a 4-week grid where each training day is mapped to a
-    calendar date. Days with completed sessions are highlighted.
-    """
-    exercise_service = ExerciseService(session)
-    workout_days = exercise_service.list_workout_days()
-
-    # Build 4-week calendar starting from Monday of current week
-    today = date.today()
-    monday = today - timedelta(days=today.weekday())
-
-    weeks = []
-    completed_dates = set()
-
-    # Get completed sessions for highlighting
-    ws_service = WorkoutSessionService(session)
-    sessions_list = ws_service.list_sessions(
-        user_id=profile.id, limit=100,
-    )
-    completed_dates = {ws.date for ws in sessions_list}
-
-    # 4 workout days per week, 4 weeks
-    for week_num in range(4):
-        week_start = monday + timedelta(weeks=week_num)
-        week_data = {
-            "week_number": week_num + 1,
-            "days": [],
-        }
-        for day_offset, workout_day in enumerate(workout_days):
-            training_date = week_start + timedelta(days=day_offset)
-            is_today = training_date == today
-            is_completed = training_date in completed_dates
-
-            week_data["days"].append({
-                "workout_day": workout_day,
-                "date": training_date,
-                "is_today": is_today,
-                "is_completed": is_completed,
-            })
-        weeks.append(week_data)
-
-    templates = request.app.state.templates
-    return templates.TemplateResponse("pages/schedule.html", {
-        "request": request,
-        "weeks": weeks,
-        "active_profile": profile,
-    })