docs: mark Step 4.1 as complete in PLAN.md

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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PLAN.md
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@@ -144,13 +144,13 @@ Check off items as completed. Each phase builds on the previous.
## Phase 4: Products & Feed
### Step 4.1: Feed Inventory Schema & Purchase
- [ ] Create migration for feed_inventory table
- [ ] Create `projections/feed.py` with FeedInventoryProjection
- [ ] Implement apply_feed_purchased (increment purchased_kg, update price)
- [ ] Implement revert_feed_purchased
- [ ] Create `services/feed.py` with purchase_feed function
- [ ] Write tests: purchase increments, price stored as cents, revert works
- [ ] **Commit checkpoint**
- [x] Create migration for feed_inventory table
- [x] Create `projections/feed.py` with FeedInventoryProjection
- [x] Implement apply_feed_purchased (increment purchased_kg, update price)
- [x] Implement revert_feed_purchased
- [x] Create `services/feed.py` with purchase_feed function
- [x] Write tests: purchase increments, price stored as cents, revert works
- [x] **Commit checkpoint** (5c10a75)
### Step 4.2: Feed Given Event
- [ ] Implement apply_feed_given (increment given_kg, decrement balance)