## Proposal Name
Guided Flow Step Block (Atomic Scene Orchestrator)

### Problem
Weeks 2 and 3 repeatedly showed that users can build scene states, but struggle to reliably wire one trigger to update camera, visibility, and transforms together. The workaround (prebuilt states + visibility toggles) is reliable, but it does not scale cleanly and lacks smooth transitions.

### User Story
A product marketer or solution engineer wants to build a 3-step 3D walkthrough where each step updates framing and object emphasis in one click. They need predictable sequencing, reset, and polished transitions without custom code.

### Proposed Builder Experience
- Author creates Step 1, Step 2, Step 3 in a single Guided Flow panel.
- Each step has bundled targets:
	- Camera state
	- Object visibility state
	- Object transform targets
	- Optional transition duration and easing
- User binds one button (or radio option) to Go To Step N.
- Runtime applies all updates atomically and shows success/failure feedback per target.
- User can preview forward, backward, jump, and reset behavior before publishing.

### Proposed Primitive / Block / Pattern
Introduce a reusable Guided Flow Step Block with:
- Data model
	- Steps array where each step includes camera, visibility, transforms, and transition metadata.
- Execution model
	- Single transactional apply for all targets in a step.
	- Deterministic last-write-wins behavior for rapid repeated interactions.
- Authoring model
	- Timeline-like step list with reorder and duplicate.
	- Built-in reset/default step.
	- Optional guardrails for invalid target bindings.
- Debug model
	- Per-step execution log showing applied targets and any failures.

### Why This Matters
- It directly solves the most repeated pain in Task 2 and Task 3 from Weeks 2 and 3.
- It upgrades Thob from workaround-based storytelling to first-class guided scene orchestration.
- It leverages current strengths already proven in Week 3: deterministic discrete state switching and strong hierarchy behavior.

### Complexity Guess
- Quick Win
	- Step schema MVP with visibility-only bundles and reset support.
- Medium
	- Full bundle support for camera + visibility + transforms with transition controls and validation.
- Deep
	- Robust orchestration runtime with rollback strategy, conflict resolution, and advanced sequencing constraints.

### Optional Tiny Demo
A tiny proof-of-concept can reuse the Week 3 reliable pattern:
- Build three authored states in one scene.
- Bind Step 1/2/3 controls through one Guided Flow block instead of manual multi-target bindings.
- Add transition duration to camera and transform updates.

What this would show:
- Same reliability as the Week 3 workaround for step order (1 to 2 to 3, 3 to 2 to 1, 1 to 3, repeated toggles).
- Better authoring clarity and lower setup friction.
- Immediate storytelling quality improvement with smooth transitions.