chore: migrate global agent rules into repository and update deployment scripts

agent-rules/rule_5_client_centric_testing.md

@@ -0,0 +1,5 @@
+# Rule 5: Client-Centric Testing Personas
+
+- **Avoid Server Bias**: Unit tests and integration tests must NOT be exclusively server-centric.
+- **Client Personas**: Tests must explicitly adopt the persona, perspective, and constraints of the client components (e.g., the `stub` or `nvim`).
+- **Validation**: Testing must validate the interaction from the client's side, ensuring that the client component correctly constructs the request, handles the connection lifecycle, and properly parses the response, rather than just verifying that the server successfully processed an isolated payload.