Rename the project to Echo (was fedserv)

Rebrand the daemon and workspace: the binary is now `echo`, every crate
is `echo-*` (`echo-api` and the module crates), Rust imports use
`echo_*`, the gRPC proto is `proto/echo.proto` with package `echo.v1`,
and the log filter, gossip peer-name default, and on-disk store default
(`echo.db.jsonl`) follow. Docs updated throughout. No behaviour change;
crate directories and the config schema are untouched.

modules/helpserv/Cargo.toml

@@ -1,8 +1,8 @@
 [package]
-name = "fedserv-helpserv"
+name = "echo-helpserv"
 version = "0.0.1"
 edition = "2021"
 description = "HelpServ: a help-desk queue — users ask, operators take and answer."
 
 [dependencies]
-fedserv-api = { path = "../../api" }
+echo-api = { path = "../../api" }

modules/helpserv/src/cancel.rs

@@ -1,4 +1,4 @@
-use fedserv_api::{Sender, ServiceCtx, Store};
+use echo_api::{Sender, ServiceCtx, Store};
 
 // CANCEL: withdraw your own newest open ticket.
 pub fn handle(me: &str, from: &Sender, ctx: &mut ServiceCtx, db: &mut dyn Store) {

modules/helpserv/src/close.rs

@@ -1,4 +1,4 @@
-use fedserv_api::{Sender, ServiceCtx, Store};
+use echo_api::{Sender, ServiceCtx, Store};
 
 // CLOSE <id> (aka RESOLVE): resolve a ticket.
 pub fn handle(me: &str, from: &Sender, id: Option<&str>, ctx: &mut ServiceCtx, db: &mut dyn Store) {

modules/helpserv/src/lib.rs

@@ -7,7 +7,7 @@
 //! `lib.rs` holds the dispatcher and the shared guard/claim helpers; each
 //! command lives in its own file.
 
-use fedserv_api::{NetView, Sender, Service, ServiceCtx, Store};
+use echo_api::{NetView, Sender, Service, ServiceCtx, Store};
 
 #[path = "request.rs"]
 mod request;

modules/helpserv/src/list.rs

@@ -1,4 +1,4 @@
-use fedserv_api::{Sender, ServiceCtx, Store};
+use echo_api::{Sender, ServiceCtx, Store};
 
 // LIST [ALL]: operators list the open queue (or every ticket with ALL).
 pub fn handle(me: &str, from: &Sender, arg: Option<&str>, ctx: &mut ServiceCtx, db: &mut dyn Store) {

modules/helpserv/src/next.rs

@@ -1,4 +1,4 @@
-use fedserv_api::{Sender, ServiceCtx, Store};
+use echo_api::{Sender, ServiceCtx, Store};
 
 // NEXT: claim the oldest unassigned ticket.
 pub fn handle(me: &str, from: &Sender, ctx: &mut ServiceCtx, db: &mut dyn Store) {

modules/helpserv/src/request.rs

@@ -1,4 +1,4 @@
-use fedserv_api::{Sender, ServiceCtx, Store};
+use echo_api::{Sender, ServiceCtx, Store};
 
 // REQUEST <message> (aka HELPME): open a help-desk ticket for the staff.
 pub fn handle(me: &str, from: &Sender, rest: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store) {

modules/helpserv/src/take.rs

@@ -1,4 +1,4 @@
-use fedserv_api::{Sender, ServiceCtx, Store};
+use echo_api::{Sender, ServiceCtx, Store};
 
 // TAKE <id> (aka ASSIGN): claim a specific ticket.
 pub fn handle(me: &str, from: &Sender, id: Option<&str>, ctx: &mut ServiceCtx, db: &mut dyn Store) {

modules/helpserv/src/view.rs

@@ -1,4 +1,4 @@
-use fedserv_api::{human_time, Sender, ServiceCtx, Store};
+use echo_api::{human_time, Sender, ServiceCtx, Store};
 
 // VIEW <id> (aka READ): operators read a ticket in full.
 pub fn handle(me: &str, from: &Sender, id: Option<&str>, ctx: &mut ServiceCtx, db: &mut dyn Store) {