docs: write README links absolute so they resolve on PyPI (#191)

Author: lesnik512

AGENTS.md

@@ -25,9 +25,12 @@ bindings, and `import_checker.py` owns every optional-dependency probe. Read the
 
 Real work **not scheduled** becomes a GitHub issue.
 
+Every link in `README.md` must be absolute: `https://github.com/modern-python/<repo>/blob/main/<path>`,
+or `.../tree/main/<path>` for a directory. Never a relative path: `README.md` is also the PyPI long
+description, and PyPI does not rewrite relative links, so a relative one 404s on the package page.
+
 An invariant is a test whose name is the claim, with a docstring opening `INVARIANT:` and a second
 paragraph naming **what breaks it** — design rationale, not a report of what this one test catches.
-Nothing enforces that docstring shape; it is read at review time.
 
 ## Code style
 

README.md

@@ -75,7 +75,7 @@ The following intentionally differ:
 
 ## 📦 [PyPI](https://pypi.org/project/lite-bootstrap)
 
-## 📝 [License](LICENSE)
+## 📝 [License](https://github.com/modern-python/lite-bootstrap/blob/main/LICENSE)
 
 ## Part of `modern-python`