docs: enforce source LOC reduction (#48)

Signed-off-by: kriptoburak <kriptoburak@users.noreply.github.com>
Co-authored-by: kriptoburak <kriptoburak@users.noreply.github.com>

Author: Burak Bayır

AGENTS.md

@@ -0,0 +1,5 @@
+# Agent instructions
+
+Each commit must reduce net handwritten source LOC. No exceptions. No one may waive this rule.
+Additions require larger, useful simplifications elsewhere in this repository.
+Formatting, minification, generated files, and deleted valuable tests or docs do not count.

CONTRIBUTING.md

@@ -55,27 +55,10 @@ PHPStan validates every generated SDK type.
 
 This guard prevents tests from mutating remote services.
 
-## Submit Changes
+## Submit changes
 
-Keep pull requests focused.
-
-Explain user-visible behavior and public contract effects.
-
-Link relevant issues and public API contracts.
-
-Use clear Conventional Commit subjects when practical.
-
-Sign every commit with the Developer Certificate of Origin:
-
-```sh
-git commit --signoff
-```
-
-Another human must review maintainer-authored, nontrivial changes.
-
-Reviewers follow the shared [review policy][review-policy].
-
-Address every review comment before merging.
+Use clear Conventional Commit subjects and sign commits with `git commit --signoff`.
+Follow the shared [review policy][review-policy].
 
 ## Report Security Issues