fix(completion): always leave a trailing space after a task name

The protocol carries one directive per response, so a single truncated wildcard prefix cost every complete name its trailing space: a Taskfile holding `deploy-*` anywhere made `task buil<TAB>` insert `build` with the cursor stuck against it. Completing a task name is the common case and the wildcard prefix the rare one, so the polarity was backwards — and the legacy wrappers, which had no notion of an incomplete candidate, always left the space.

A wildcard prefix now gets a space it does not want, which is the accepted trade until suggestions can carry a directive of their own. Required variables keep NoSpace: there a free-form `VAR=` is the common case, not the exception.

internal/complete/complete_test.go

@@ -166,7 +166,9 @@ func TestComplete_WildcardTaskNames(t *testing.T) {
 	// Patterns are cut at their first `*`: `wildcard-*` and `wildcard-*-*`
 	// collapse into one candidate, and `*-wildcard-*` leaves nothing to insert.
 	require.Equal(t, []string{"build", "matches-exactly-", "release-", "start-", "s-", "wildcard-"}, values(suggs))
-	require.Equal(t, complete.DirectiveNoSpace|complete.DirectiveNoFileComp, dir)
+	// A truncated prefix costs the whole response its trailing space, so task
+	// names keep theirs and the wildcard prefix gets one it does not want.
+	require.Equal(t, complete.DirectiveNoFileComp, dir)
 	// Without a desc, the pattern says what the prefix stands for.
 	require.Contains(t, descriptions(suggs), "wildcard-*")
 

internal/complete/engine.go

@@ -67,7 +67,6 @@ func completeTaskNames(e *task.Executor, opts Options) ([]Suggestion, Directive)
 
 	out := make([]Suggestion, 0, len(tasks))
 	seen := make(map[string]bool, len(tasks))
-	anyPartial := false
 	add := func(name, desc string) {
 		value, partial := suggestedName(name)
 		// `*-wildcard-*` has no prefix, and `wildcard-*` / `wildcard-*-*` share one.
@@ -75,11 +74,9 @@ func completeTaskNames(e *task.Executor, opts Options) ([]Suggestion, Directive)
 			return
 		}
 		seen[value] = true
-		if partial {
-			anyPartial = true
-			if desc == "" && !opts.NoDescriptions {
-				desc = name
-			}
+		// Without a desc, a truncated pattern says what its prefix stands for.
+		if partial && desc == "" && !opts.NoDescriptions {
+			desc = name
 		}
 		out = append(out, Suggestion{Value: value, Description: desc})
 	}
@@ -94,10 +91,8 @@ func completeTaskNames(e *task.Executor, opts Options) ([]Suggestion, Directive)
 		}
 	}
 
-	// A truncated pattern is half a name: the cursor must stay against it.
-	if anyPartial {
-		return out, DirectiveNoSpace | DirectiveNoFileComp
-	}
+	// A single truncated wildcard prefix would otherwise cost every complete
+	// name its trailing space: the directive covers the whole response.
 	return out, DirectiveNoFileComp
 }