zunda_shiwake/README.md

# Chick Sorter v14.0 Zunda Tax / Resale

## Changes in this build
- Changed Egg Farm build price to `￥250`.
- Replaced the previous daily Fairies fee with `ZUNDA TAX`, paid when `Next Day` is pressed.
- `ZUNDA TAX` taxes only cash above `￥500`: `ceil((cash - 500) × rate)`, with 5% added per `￥500` band and a 95% cap.
- Removing equipment from a previous Build phase now sells it for 50% of its build price; same-Build removals still refund 100%.
- Removed visible `STOPPED` text/highlight. Blocked chicks simply stay still.
- Removed route-overlay arrows/colored flow arrows. Conveyor movement is now shown by small direction triangles inside belt tiles.
- Moved the starter S1 position lower so the Egg Farm and S1 have more distance.
- Moved the Truck to the bottom side of the grid and connected the starter S2-to-Truck belt to the new receiver.
- Made scanner and facility ports strict: a belt must occupy the exact port cell to count as connected.
- Expanded `Next Day` validation to scanner inputs/outputs and planned output routes, not just machine receiver cells.
- Build buttons for unaffordable equipment, or already-built unique machines, are disabled and visually faded.
- Removed Close buttons from clicked-equipment/upgrade popovers. Click outside the popover to close it.
- Kept `src/index.html` and `src/styles.css` removed; the project uses the root `index.html` and `styles.css` only.
- Continued centralized price/income/fine/facility definitions in `src/core/config.js`, shared text in `src/core/text.js`, and economy logic in `src/systems/economy.js`.

## Structure ideas for the next cleanup pass
- Move HTML button content to a data-rendered build panel instead of hard-coded markup.
- Give every equipment object a `defId`, so runtime state never duplicates names, prices, sizes, or upgrade rules.
- Store routes as cell arrays and convert to pixel paths only at movement/draw time.
- Cache route plans per build session, then invalidate once on build/erase/drag instead of recomputing every draw.
- Split route validation into errors and warnings, so optional/unused equipment can be supported later without blocking the day.
- Remove legacy fallback paths after save compatibility is no longer needed.