pip: track main's packaging and tooling config

The merge keeps this branch's own dependencies and extras, which are
deliberately reduced, but the rest of pyproject.toml should not diverge.
Missing here and present on main:

- unsloth_cli package-data, node_prebuilt_pins.json and the backend/assets
  jinja/html globs, so the wheel was not shipping files the code loads
- ruff line-length and pytest pythonpath

test_pins_manifest_is_declared_in_package_data now passes on this branch.

pyproject.toml

@@ -64,10 +64,12 @@ version = {attr = "unsloth.models._utils.__version__"}
 include-package-data = true
 
 [tool.setuptools.package-data]
+unsloth_cli = ["codex_fallback_prompt.md", "pi_subagent.ts"]
 studio = [
     "*.sh",
     "*.ps1",
     "*.bat",
+    "node_prebuilt_pins.json",
     "frontend/dist/**/*",
     "frontend/*.json",
     "frontend/*.ts",
@@ -77,6 +79,8 @@ studio = [
     "frontend/.git*",
     "backend/requirements/**/*",
     "backend/plugins/**/*",
+    "backend/assets/**/*.jinja",
+    "backend/assets/**/*.html",
     "backend/core/data_recipe/oxc-validator/*.json",
     "backend/core/data_recipe/oxc-validator/*.mjs",
 ]
@@ -756,6 +760,7 @@ repository = "https://github.com/unslothai/unsloth"
 
 [tool.ruff]
 target-version = "py311"
+line-length = 100
 force-exclude = true
 extend-exclude = [
     "*chat_templates.py",
@@ -787,4 +792,5 @@ ignore = [
 # Narrow the default test discovery so `pytest` from the repo root
 # does NOT pick up the GPU-heavy tests under tests/python, tests/qlora,
 # etc. The CI security job runs `pytest tests/security` explicitly.
+pythonpath = ["."]
 testpaths = ["tests/security"]