feat(pipeline): add runnable artifact pipeline increment

[Change Nature]
- This commit adds the first runnable increment of the F# artifact
  pipeline: CLI, server, frontend bundle, stage fixture, and tests.
  It is feature work, not a bug fix.

[New Capability]
- CLI `run` executes the three-step Blender fixture through the process
  bridge and writes GLBs, step logs, events, and a manifest; `verify`
  validates a manifest without Blender.
- Server exposes run start, run-scoped SSE, artifact manifest/file
  routes, and serves the Fable frontend from its build output.
- Frontend starts runs, follows run-scoped SSE progress, and links the
  artifact manifest on completion.

[Implementation]
- Shared layer holds domain, run state, replay, and artifact contracts;
  Modeling holds the pipeline, 120s bridge timeout, and result-file
  protocol; stage/blender/fixture.py owns geometry in Python (bpy owns
  geometry, F# owns orchestration).
- Fable bundle is regenerated into public/ and copied by the server
  project; solution includes all projects with warnings-as-errors.
- README documents build, Fable, server, interpreter/env, fixture
  limitations, and current verification status.

[Impact]
- Verified: 40/40 solution tests pass; Release build 0 warnings/errors;
  real CLI run with bpy 5.0.1 produced 3 GLBs, 3 logs, and a
  verify-clean manifest; isolated-port server smoke flow succeeded.
- Not yet verified: browser end-to-end behavior and production
  fidelity. Artifacts and caches are gitignored.

1 files changed, 51 insertions, 0 deletions

diff --git a/src/SomhairlesDream.Cli/Program.fs b/src/SomhairlesDream.Cli/Program.fs
new file mode 100644
index 0000000..0d9ed1c
--- /dev/null
+++ b/src/SomhairlesDream.Cli/Program.fs
@@ -0,0 +1,51 @@
+namespace SomhairlesDream.Cli
+
+open System
+open System.IO
+open SomhairlesDream.Modeling
+
+module Program =
+    let private bridgeFailure (message: string) =
+        message.StartsWith("blender bridge:", StringComparison.OrdinalIgnoreCase)
+
+    let private run options =
+        let bridge = BlenderProcessBridge(options.Python, options.StageRoot) :> IArtifactBridge
+
+        let pipelineOptions : PipelineOptions =
+            { ArtifactRoot = options.OutputRoot
+              Ids = options.Ids
+              Render = options.Render
+              Bridge = bridge
+              Clock = fun () -> DateTimeOffset.UtcNow
+              OnEvent = ignore }
+
+        match Pipeline.run pipelineOptions with
+        | Ok _ ->
+            let manifestPath = Path.Combine(options.OutputRoot, options.Ids.ProjectId, options.Ids.RunId, "manifest.json")
+            printfn "%s" (Path.GetFullPath(manifestPath))
+            0
+        | Error message ->
+            eprintfn "%s" message
+            if bridgeFailure message then 3 else 4
+
+    let private verify path =
+        match ArtifactVerifier.verify path with
+        | Ok _ ->
+            printfn "%s" (Path.GetFullPath(path))
+            0
+        | Error message ->
+            eprintfn "%s" message
+            4
+
+    [<EntryPoint>]
+    let main argv =
+        match Arguments.parse argv with
+        | Ok Help ->
+            printfn "%s" Arguments.usage
+            0
+        | Ok(Run options) -> run options
+        | Ok(Verify path) -> verify path
+        | Error message ->
+            eprintfn "%s" message
+            eprintfn "%s" Arguments.usage
+            2