fix(calibre): make setup.py path-safe and ship README in wheel

- Resolve README.md relative to setup.py via Path(__file__).parent
- Open README with explicit utf-8 encoding
- Add include_package_data=True and include README.md in package_data
  so 'pip install ./calibre/agent-harness' works from any cwd and the
  installed wheel ships SKILL.md plus README.md.

Addresses reviewer feedback on PR #223 (Phase 2).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

calibre/agent-harness/setup.py

@@ -1,13 +1,21 @@
+from pathlib import Path
+
 from setuptools import setup, find_namespace_packages
 
+BASE_DIR = Path(__file__).parent
+long_description = (BASE_DIR / "cli_anything" / "calibre" / "README.md").read_text(
+    encoding="utf-8"
+)
+
 setup(
     name="cli-anything-calibre",
     version="1.0.0",
     description="CLI harness for Calibre e-book manager — part of the cli-anything toolkit",
-    long_description=open("cli_anything/calibre/README.md").read(),
+    long_description=long_description,
     long_description_content_type="text/markdown",
     packages=find_namespace_packages(include=["cli_anything.*"]),
-    package_data={"cli_anything.calibre": ["skills/*.md"]},
+    include_package_data=True,
+    package_data={"cli_anything.calibre": ["skills/*.md", "README.md"]},
     install_requires=[
         "click>=8.0.0",
         "prompt-toolkit>=3.0.0",