Prepare 1.7.7 with concise comments and shared CI policy

README.md

@@ -9,6 +9,13 @@ Pluggable AACS key sources (keydb, online key service) for
 and hands libfreemkv its terminal Unit Keys via `get_unit_keys`; the library
 does all derivation.
 
+## Development
+
+Build API documentation with `cargo doc --no-deps --open` for source construction,
+keydb paths and online-query contracts. Run `cargo test --tests` to validate
+parsing, caching and request guards. Tests use synthetic keys and local fixtures;
+never commit real key material or credentials.
+
 ## License
 
 MIT — see [LICENSE](LICENSE).