chore: move circuitforge-orch to optional extras group

Free-tier users get a clean `pip install snipe` (or pip install -e .)
without hitting a resolution error for circuitforge-orch, which is not
on PyPI and is a Paid+ feature.

Runtime tier gate in runner.py / main.py already handles the missing-
package case gracefully (falls back to LLMRouter when GPU_SERVER_URL
is unset). Install-time gating was a violation of the CF MIT boundary.

Upgrade path: pip install snipe[orchestration]

Closes: #56

pyproject.toml

@@ -24,10 +24,15 @@ dependencies = [
     "cryptography>=42.0",
     "PyJWT>=2.8",
     "httpx>=0.27",
-    "circuitforge-orch>=0.1.0",
 ]
 
 [project.optional-dependencies]
+orchestration = [
+    # Paid+ tier only — not published to PyPI. Install from source or Forgejo Packages.
+    # pip install -e ../circuitforge-orch  (dev)
+    # pip install snipe[orchestration]     (self-hosted Paid+)
+    "circuitforge-orch>=0.1.0",
+]
 dev = [
     "pytest>=8.0",
     "pytest-cov>=5.0",