# Artifact Pipeline Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Complete the typed artifact pipeline from the shared contract through the Blender CLI, server SSE, and browser manifest link.

**Architecture:** Keep `SomhairlesDream.Shared` as the wire contract, put deterministic artifact writing and Blender invocation in `SomhairlesDream.Modeling`, expose it through a thin CLI, and have the ASP.NET server run the same pipeline asynchronously. Preserve the existing replay store and UI path.

**Tech Stack:** F#/.NET 8, ASP.NET Core minimal APIs, `System.Text.Json`, `System.Diagnostics.Process`, xUnit, Blender Python fixture.

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### Task 1: Align contracts and lifecycle validation

**Files:** `src/SomhairlesDream.Shared/Artifact.fs`, `src/SomhairlesDream.Modeling/Definitions.fs`, `src/SomhairlesDream.Server/Store.fs`, and the corresponding Shared/Modeling/Server tests.

- [ ] Add checkpoint `TotalSteps` and serialize it as flat camel-case JSON.
- [ ] Make design object IDs cumulative snapshots and require completion only after all ordered checkpoints.
- [ ] Verify focused tests and keep legacy `RunStore` behavior unchanged.

### Task 2: Implement the Blender bridge and CLI

**Files:** `src/SomhairlesDream.Modeling/BlenderBridge.fs`, `src/SomhairlesDream.Cli/Program.fs`, `stage/blender/fixture.py`, project files, and CLI/Modeling tests.

- [ ] Add a process bridge using `ProcessStartInfo.ArgumentList`, bounded to 120 seconds, with structured result/error handling, an explicit result file, and retained stdout/stderr logs.
- [ ] Add the deterministic `bpy` fixture with step validation, object custom properties, GLB reimport verification, and optional PNG render.
- [ ] Add CLI `run` and `verify` exit-code behavior and test fake-bridge/argument paths.

### Task 3: Wire server execution and SSE

**Files:** `src/SomhairlesDream.Server/Program.fs`, `src/SomhairlesDream.Server/Store.fs`, server project/tests.

- [ ] Add the Modeling reference and launch the same pipeline in a background task.
- [ ] Implement exact-run start, SSE, manifest, artifact, validation, conflict, and 404 responses.
- [ ] Add one-second stale observation without changing lifecycle status.

### Task 4: Update browser and solution wiring

**Files:** `src/SomhairlesDream.Frontend/App.fs`, `public/index.html`, `public/App.js`, and `SomhairlesDream.sln`.

- [ ] Start a selected run, subscribe to its exact SSE stream, and expose `artifact-manifest-link` only on completion.
- [ ] Preserve replay behavior and the existing `Uint32BufferAttribute` mesh path.
- [ ] Include Modeling and CLI projects in the solution.

### Task 5: Verify and publish

- [ ] Run all project tests and builds.
- [ ] Run the real `bpy 5.0.1` integration and CLI verification, then server/browser checks.
- [ ] Review status/diff, commit only scoped project files, publish to the authorized bare repository, and verify `git ls-remote` plus cgit.