[WilliamRagstad]

Adds inventory definitions, branching dialogue nodes and choices, item rewards, pickup/talk actions and item-gated hotspots. Authors can build the included three-room adventure entirely through the editor controls. A native modal rehearses those interactions on an isolated project snapshot; restart clears its session and closing it preserves the authored project.

Includes an illustrated authoring walkthrough, a portable three-room draft generated through UI actions, and CI for Rust checks, a release WASM build and Chromium interactions. Also fixes dropdown selections after revisiting objects, guards recovery-quota failures without falsely clearing unsaved state, rejects non-finite serialization, and exercises pointer movement and Escape cancellation.

Depends on #2 and targets its branch.

Still blocked by PACE core: the inspected upstream revision has no versioned format or executable runtime to pin. The example is editor-owned, and Rehearse draft is explicitly an editor simulation. Core preview and Export game remain disabled. This stack does not satisfy core-format serialization or pinned-runtime preview/export; runtime.lock.json records a null runtime revision and docs/core-integration.md describes the remaining adapter work. The PR stays draft for that dependency.

Validation passed locally:

• 13 Rust integration tests covering serialization, asset integrity checks, ID/reference handling, history, geometry, item gates and dialogue transitions.
• Four Playwright tests against the release build in Chromium. They author all three rooms through controls, traverse both dialogue branches and room/item gates, verify return links, compare complete project data before/after rehearsal and reopen, exercise canvas interactions, check displayed dropdown selections, and test invalid files, recovery quota failure and cancellation.
• cargo fmt --all -- --check, cargo clippy --workspace --all-targets --locked -- -D warnings, the WASM target check and trunk build --release --locked.

Initial supported platform: web/WebAssembly; Rust 1.90.0, Dioxus 0.5.6, Trunk 0.21.14.