feat(sasch40): add Nebenraum, Marktplatz minigame & trapdoor to Hinterzimmer

- Split GameBoy chassis brand header: 'AKT III' on clean dedicated second line
- Add 5-room tavern architecture: Schankraum, Nebenraum, Marktplatz, Hinterland, Hinterzimmer
- Introduce Nebenraum (Kemenate/Atelier) with Amy at her easel painting the neon banner and Zuluman magic mirror
- Update Marktplatz scene with Mario juggling chainsaws/hops and NAT on the festival stage
- Implement Wildschwein-Schnick-Schnack-Schnuck minigame against NAT (Best of 3, Keiler > Dickicht > Lanze > Keiler)
- Replace secret tap with cellar floor trapdoor ('Luke zum Hinterraum') initially invisible
- Update automated playtest covering all 25 screens with zero console/network errors
- Document all architectural decisions in projects/sasch40/AGENTS.md

projects/sasch40/AGENTS.md

@@ -115,16 +115,29 @@ This document records the foundational design decisions, their rationale ("Why")
 
 ---
 
-### 9. Easter Egg Invisibility Pattern (`TavernView.vue`)
-*   **The Decision**: Secret hotspots (e.g. `secret-tap-hotspot` in the Schankraum) must be 100% invisible initially.
+### 9. Cellar Trapdoor & Easter Egg Invisibility Pattern (`TavernView.vue`)
+*   **The Decision**: Secret hotspots (the cellar trapdoor `.trapdoor-hotspot` in the Schankraum leading to the VIP Hinterzimmer) must be 100% invisible initially.
 *   **Why**: An Easter egg marked with a glowing button or text badge is not a secret; it invites immediate trivial clicking.
 *   **The Rule**:
     *   The button must render with transparent background, no border, no outline, no box shadow, no hover change, and no tooltip (`:title="undefined"`).
-    *   Only upon the user's first click does it reveal the gold key icon, play a celebratory fanfare, unlock the Easter egg in the game store (+500 points), and transition to the secret room.
+    *   Only upon the user's first click does it reveal the door icon, label itself *„Luke zum Hinterraum“*, play a celebratory fanfare, unlock the Easter egg in the game store (+500 points), and transition to the secret room.
 
 ---
 
-### 10. LocalStorage Persistence & Clean Game Reset (`gameStore.ts`)
+### 10. Multi-Room World Architecture & Tavern Minigames (`TavernView.vue`)
+*   **The Decision**: Act III is structured as a spatial, interconnected five-room village hub rather than a cramped single screen:
+    1.  **Gaststube (Schankraum)**: King Sascha's table, Queen Verena on the balcony, Armend at the forge, Lutz (ZTUL) at the fireplace, door to Nebenraum, door to Marktplatz, and the secret *„Luke zum Hinterraum“* in the floor.
+    2.  **Königlicher Nebenraum (Kemenate & Atelier)**: Amy painting the royal *„Rave the Kingdom!“* banner at her easel in overalls, and the golden Zuluman magic mirror on the wall.
+    3.  **Haumdaucher Marktplatz**: Mario acrobatically juggling chainsaws and hops on the cobblestones; NAT (Josef) on the wooden festival stage with wild boar banners telling stories of his girls and heroic deeds.
+    4.  **Alpines Hinterland**: Mane (Ramona) hiking the alpine trail with walking stick; Hansi on the panoramic bench.
+    5.  **Geheimes VIP-Hinterzimmer**: Secret rave with disco chandelier, stroboscope, Pü's crystal staff, DJ Flo Maier, and Viktor the night-guard.
+*   **Minigames & Exit Safety**:
+    *   **Bayerisches Gstanzl-Fechten**: Multi-round insult rhyming duel. Must always include a visible `[✕]` close button so players are never trapped.
+    *   **Wildschwein-Schnick-Schnack-Schnuck**: Best-of-3 tactical duel against NAT. Rules: 🐗 Keiler bricht 🌿 Dickicht, 🌿 Dickicht fängt 🏹 Lanze, 🏹 Lanze erlegt 🐗 Keiler. First to 2 points wins (+10 Korken, 1 Helles, `wildschwein_meister` achievement). Includes `[✕]` close button.
+
+---
+
+### 11. LocalStorage Persistence & Clean Game Reset (`gameStore.ts`)
 *   **The Decision**: Game state automatically synchronizes to `localStorage` (`sasch40_game_save_v1`) on every mutation and is cleanly wiped when clicking *„🔄 NOCHMAL SPIELEN“*.
 *   **Why**: Mobile users frequently refresh or switch apps to snap photos. Without persistence, a browser reload resets their progress back to Act I.
 *   **The Rule**:
@@ -151,7 +164,7 @@ make all
 
 The `Makefile` targets:
 *   `compile`: Runs `npm run build` (`vue-tsc -b && vite build`).
-*   `build`: Runs `docker build --platform linux/amd64 -t sasch40:latest .` (copies `dist/` directly into `nginx:alpine`).
+*   `build`: Runs `docker build --no-cache --platform linux/amd64 -t sasch40:latest .` (copies `dist/` directly into `nginx:alpine`).
 *   `tag`: Tags as `registry.haumdaucher.de/sasch40:latest`.
 *   `push`: Pushes to the Haumdaucher registry.
 *   `deploy`: Executes `kubectl rollout restart deployment/sasch40 -n web` and monitors rollout status.
@@ -171,7 +184,9 @@ This script:
 2.  Verifies the Intro Screen and clicks Start.
 3.  Simulates dialogue options on the Castle Balcony (Prologue).
 4.  Tests movement and jump controls in Act II (Hopfen-Pfade).
-5.  Interacts with hotspots, dialogue modals, and the Gstanzl duel in Act III (Taverne).
-6.  Advances through the Party Express and reaches the Royal Certificate.
-7.  Captures 10 screenshots to verify zero visual regressions.
-8.  Asserts zero console errors, zero failed HTTP requests, and zero broken images.
+5.  Interacts with all 5 rooms, hotspots, dialogue modals, Zuluman mirror, Luke zum Hinterraum, Gstanzl duel, and the Wildschwein duel in Act III (Taverne).
+6.  Tests reload persistence in `localStorage`.
+7.  Advances through the Party Express (Act IV) and reaches the Royal Certificate (Act V).
+8.  Tests the `🔄 NOCHMAL SPIELEN` button and verifies return to Intro.
+9.  Captures 25 screenshots to verify zero visual regressions.
+10. Asserts zero console errors, zero failed HTTP requests, and zero broken images.