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README.md

@@ -1,145 +1,28 @@
-# Chick Sorter v23.0 Phase 2 Routefix Hotfix
+# Chick Sorter v27.0 Cleanup Build
 
+Open `index.html` in a browser.
 
-This build changes the SHREDDER Improvement payout rule.
+## Current baseline
 
-## v18 changes
-- `SHREDDER Improvement` now uses one payout roll per processed item.
-- Probability after n cards: `((√n / 2) × n)%`.
-- Maximum SHREDDER Improvement cards counted: 30.
-- At 30 cards, the chance is about 82.16%, so the expected payout is about ￥0.8216 per processed item.
+- Build, move, box-select, sell, and repair factory equipment during Build phase.
+- Start the next day only when at least one EGG route reaches a scanner and then any valid exit.
+- Fairies tribute is paid after day-end settlement and before the next Build phase.
+- Bankruptcy is checked only at that day-end transition. Temporary negative cash during production does not immediately end the game.
+- Cards use English names and descriptions with numeric effect summaries.
+- `poop.png` is the only bundled image asset currently used by default; other art falls back to canvas drawing.
 
-## SHREDDER Improvement expected value
+## Controls
 
-```text
-n = min(SHREDDER Improvement cards, 30)
-p = ((√n / 2) × n)% = n√n / 200
-Per item payout X ~ Bernoulli(p)
-E[X] = p yen = n√n / 200 yen
-```
+- S1 manual scanner: `A` = left / `D` = right.
+- S2 manual scanner: `←` = left / `→` = right.
+- Build phase: left-drag empty map for box selection; drag selected equipment to move it.
+- Right-drag: pan.
+- `Ctrl+Z` / `Ctrl+Y`: undo / redo.
+- `Esc`: cancel upgrade-card target selection.
 
-For k shredded items, expected total bonus is `k × n√n / 200` yen.
+## Cleanup in this build
 
----
-
-# Previous build notes
-
-# Chick Sorter v17.0 Shredder Card and Cleanup
-
-This build adjusts selling constraints, timeout cleanup, settlement UI, and adds the SHREDDER improvement card.
-
-## v17 changes
-- The last EGG FARM, MIXER, SHREDDER, and TRUCK can no longer be sold.
-- Non-last equipment still follows the existing rule: same Build phase removal refunds 100%, older equipment sells for 50%.
-- When the day timer and shutdown grace expire, remaining chicks/poop are blown off the conveyors with no equipment damage.
-- Settlement appears 1 second after that cleanup.
-- The day settlement modal is reduced to two lines: one simple formula and final profit.
-- Added `SHREDDER Improvement` card.
-  - Each card adds one independent trial per shredded item.
-  - Each trial has a 1/3 chance to pay ￥1.
-  - Expected value per processed item after n cards: n / 3 yen.
-- EGG FARM price remains ￥250.
-
-## SHREDDER Improvement expected value
-
-```text
-Per item payout X ~ Binomial(n, 1/3)
-E[X] = n × 1/3 = n/3 yen
-```
-
-For k shredded items, expected total bonus is `k × n / 3` yen.
-
----
-
-## Previous notes
-
-This build refines the v15 card and tax system.
-
-## v16.1 changes
-- Fixed equipment improvement target-picking overlay by importing the target bounds helper into the renderer.
-- Non-candidate equipment now receives a full dark overlay, and valid upgrade candidates are explicitly white-highlighted.
-- Added a fallback message when a target picker has no valid target, so the game no longer appears frozen.
-
-## v16 changes
-
-- `Extra Cards` is now immediate.
-  - Selecting it consumes the current card pick, then grants 2 more card selections in the same draft.
-  - It no longer increases future draft size.
-- Equipment improvement cards now target machines on the map.
-  - Valid targets are highlighted in white.
-  - Non-target areas are darkened.
-  - Click a highlighted machine to apply the upgrade.
-  - `Esc` cancels target selection and returns to the card draft.
-- ZUNDA TAX and Fairies tribute no longer contaminate the next day’s profit display.
-  - They are still paid when `Next Day` is pressed.
-  - They still affect cash and total outflow.
-  - They are not counted inside the new day’s `Turn Profit`.
-- ZUNDA TAX exemption / Legal Work behavior was rechecked and kept explicit.
-  - Base exemption: ￥500.
-  - `Legal Work`: exemption +￥250 and 95% cap point +￥250.
-  - Tax rate: 5% from the first yen above the exemption.
-  - +5% per ￥500 taxable band.
-  - Maximum rate: 95%.
-- EGG FARM price remains ￥250.
-
-## Active ZUNDA TAX formula
-
-```text
-taxable = max(0, cash - exemption)
-rate = min(95%, ceil(taxable / 500) × 5%)
-ZUNDA TAX = ceil(taxable × rate)
-```
-
-With no `Legal Work`, `exemption = ￥500`, so ￥501 starts at 5% and ￥10,000 reaches 95%.
-
-## v19 changes
-- Added collapsed bottom-left debug panel: infinite cash, day override, free upgrade purchase.
-- Added `src/core/balance.js` as the primary balance-tuning sheet for prices, income, penalties, timing, card rates, and caps.
-- Increased UI text size.
-- Auto Scanner base cooldown is now 2.25 seconds.
-- High-Quality Bearing now adds +7.5% conveyor speed per card.
-- Equipment click popover removed; hover now shows flavor text and equipment information.
-- ERASE button renamed to SELL.
-- Card drafts can contain up to 2 dud cards; each slot has a 30% dud chance. Dud cards can be clicked away without spending a pick.
-
-## v20 Phase 1 structural changes
-- Added a canonical FactoryGraph in `src/systems/routing.js`.
-  - Build/edit operations invalidate the graph.
-  - Route planning, connection validation, congestion component lookup, and debug metrics now read from the same graph model.
-  - Scanner and facility ports are exact grid cells; visual adjacency is not accepted as connectivity.
-- `Next Day` now commits the current FactoryGraph before fees and day start.
-  - The committed snapshot records conveyor cells, edges, components, port counts, farm outputs, and validation issues.
-- Added `src/systems/gameEvents.js`.
-  - Major lifecycle, cash, build/sell, move, cleanup, and jam events are stored in a bounded run log.
-- Expanded the debug panel from cheats only into an observability panel.
-  - Shows FactoryGraph size, components, port status, farm outputs, dead ends, active/queued items, max congestion, and recent events.
-- This is a structural pass, not a content/balance pass. It is meant to make later map generation, market contracts, route diagnostics, replay, and deeper factory simulation safer to add.
-
-## v21 Phase 2 structural changes
-
-Implemented the Phase 2 foundation without the market board or programmable scanner logic.
-
-- Added seeded no-build terrain generation. Roughly 20% of grid cells become blocked each run while preserving the initial critical route.
-- Added equipment degradation based on actual use.
-  - Truck and Manual Scanner are exempt and always operate normally.
-  - Conveyor tiles degrade from item pass counts and reduce local belt speed.
-  - Egg Farms degrade from egg production and gradually increase spawn interval.
-  - Mixer, Waste Shredder, and Auto Scanner degrade from processing counts and add delay.
-  - Equipment keeps full performance until 50% durability remains; at 0% durability it performs at half speed.
-- Added dirty overlay rendering for degraded equipment.
-- Added a one-day repairman hire button. The repairman costs ￥100 for the next production phase, walks freely across the map, and repairs 1% degradation every 3 seconds.
-- Expanded debug/hover readouts with blocked-cell and degradation information.
-
-Market contracts and deeper scanner-programming logic are intentionally left for later Phase 2 work.
-
-## v22 Phase 2 starter-route protection
-
-No-build generation now protects the complete initial factory footprint before blocked cells are placed. The protected footprint includes the default Egg Farm, scanner bodies, scanner input/output ports, machine receiver cells, and every starter conveyor segment. After blocked-cell generation, the starter backbone is scrubbed from the blocked set and reinstalled as a final guard.
-
-Result: even with roughly 20% no-build cells, the initial line remains continuous from Egg Farm to S1, S1 to S2, and S2 to both Shredder and Truck exits.
-
-
-## v23 hotfix
-
-- Fixed the startup ReferenceError caused by binding the repairman button to a missing `hireRepairman` wrapper.
-- Disabled optional external art probing by default, preventing 404 console noise for placeholder image filenames. Canvas fallback art remains active.
+- Removed duplicate `src/index.html` and `src/styles.css`; root `index.html` and `styles.css` are the single launch surface.
+- Removed the old debug panel, debug hotkey, debug event log, and free-upgrade/debug-cash code.
+- Removed the obsolete right-side selected-facility panel code left behind after the UI removal.
+- Removed stale historical README files and old changelog text that no longer matched the current specification.