# SHiRE Academy Stage 3C.3.3 — Dice-Tower Exit Chute

This patch upgrades the validated Stage 3C.3 Gothic dice-tower family after visual inspection of `Cathedral of the Abyss Dice Tower V1` showed that the doorway had no controlled ramp into the collection tray.

## What changes

- Makes an internal-to-external exit chute mandatory for every Gothic dice-tower draft.
- Aligns the lowest internal ramp with the pointed-arch doorway and chute.
- Repositions the ramp stack downward so the final ramp reaches the door rather than ending above it.
- Adds low chute side rails to keep dice centred during the transition.
- Prevents a vertical-drop exit through explicit specification and validation fields.
- Adds configurable exit-chute angle and length with safe limits.
- Shows the chute, final-ramp alignment and controlled door-to-tray path in the safe-plan interface.
- Adds two deterministic Academy lessons:
  - `dice-tower.exit-chute`
  - `dice-tower.final-ramp-alignment`
- Expands autonomous evidence from 72 to 78 runs while preserving completed progress.

## Mandatory V2 route

`alternating internal ramps → final ramp → pointed Gothic arch → sloped exit chute → collection tray`

## Installer proof

Before activation, the installer must create three real STEP/STL dice-tower variants through the persistent CadQuery Unix-socket engine. Every variant must pass:

- one valid final solid;
- exact requested bounding dimensions;
- internal ramp and dice-clearance gates;
- integrated collection tray;
- exit-chute presence, angle and width gates;
- final-ramp alignment;
- controlled-roll path with vertical drop disabled.

The warm engine continues writing only under the allowlisted FastBuilder system-test tree. Completed evidence is copied to the Learning Bridge capability tree only after validation.

## Permanent boundaries

- Existing 371-skill Academy state remains read-only.
- Boolean canary is not rerun.
- No counted attempt is consumed.
- No certification or Forge permission changes.
- No arbitrary prompt or code execution.
- No external network research.
- No public ports.
- Output remains a non-load-bearing draft requiring 3D inspection, slicer review and a physical dice-flow test.