rewrite comments in neutral, terse style

Doc comments, inline comments, and README no longer editorialize about
the code (ActiveRecord, leak, fake, Yak before/after). They now describe
behavior only. Test A_client_can_reach_its_DbContext__the_leak renamed
to A_client_can_reach_its_DbContext. No behavior changes; all 27 tests
pass.

src/Before.Console/Program.cs

@@ -1,15 +1,7 @@
 using Before;
 
-// ---------------------------------------------------------------------------
-// Before.Console — a straight-line demo of the ActiveRecord-style pattern.
-//
-// The console app sets DbBase.Context (the shared singleton) once at startup,
-// then creates client/order entities, saves them through the context, and
-// queries back using the ActiveRecord entry points:
-//   • Client.FindByName(name) — no context argument: rides the
-//     DbBase.Context singleton
-//   • listing via DbBase.Context!.Tracked
-// ---------------------------------------------------------------------------
+// Before.Console — seeds clients and orders, saves them through the
+// DbContext, and queries them via the Client finders and DbBase.Context.
 
 var ctx = new DbContext();
 DbBase.Context = ctx;
@@ -23,7 +15,7 @@ jane.Orders.Add(new Order { Description = "Website redesign" });
 
 bob.Orders.Add(new Order { Description = "Monthly retainer" });
 
-// Orders need to be attached too so they get IDs:
+// Orders are attached separately so they get IDs:
 ctx.Attach(jane.Orders[0]);
 ctx.Attach(jane.Orders[1]);
 ctx.Attach(bob.Orders[0]);
@@ -43,7 +35,6 @@ foreach (var client in DbBase.Context!.Tracked.OfType<Client>())
 
 // ----- find by name -------------------------------------------------------
 Console.WriteLine("\n=== Find by Name (null-returning) ===");
-// No context argument: FindByName falls back to the DbBase.Context singleton.
 var found = Client.FindByName("Jane Doe");
 if (found is not null)
 {
@@ -68,7 +59,7 @@ catch (ObjectNotFoundException ex)
     Console.WriteLine($"Not found: {ex.Message}");
 }
 
-// Show the contrast with a non-existent name:
+// ----- a name that matches nothing ----------------------------------------
 Console.WriteLine("\n=== Miss: null-returning vs throwing ===");
 var missNull = Client.FindByName("Nobody Here");
 Console.WriteLine($"FindByName(\"Nobody Here\"): {(missNull == null ? "null" : missNull.Name)}");