A build is taken in where its outcome is heard, and the build tool answers at once (issue 176)

The console's `build` tool answered "no build machine answered within 0s", handed a forge path to
git as written, and a build heard afterwards was recorded and never registered: recording and
registration lived only in the waiting caller, and the tool did not wait.

Now one function takes a build's outcome in — records it, parses the manifest, refuses a definition
naming an installation, registers the module with its source as the seat and path the request
carried — and both the waiting command and the daemon that follows the role's `built` event call
it. `build --wait 0` asks and returns with the id; `builds --log <id>` follows it. The seat verb
says `--self` for a repository given without a scheme.

internal/link/build.go

@@ -49,6 +49,17 @@ type BuildRequest struct {
 	// which forge holds the seat here. A builder handed no base for a seat a context names refuses
 	// the build and says so.
 	Seats map[string]string `json:"seats,omitempty"`
+	// Source is the repository as the mesh records it when it lives on a seat's holder — the seat
+	// and the path on it, never the URL just composed (novox/hq ADR 0111). Carried with the
+	// asking and echoed in the outcome, so whoever hears the outcome can register the module with
+	// its true source, whether or not they were the one who asked (novox/hq issue 176).
+	Source *SourceOnSeat `json:"source,omitempty"`
+}
+
+// SourceOnSeat names a repository by the seat whose holder serves it and its path there.
+type SourceOnSeat struct {
+	Seat       string `json:"seat"`
+	Repository string `json:"repository"`
 }
 
 // BuildResult is what a builder says back.
@@ -101,6 +112,9 @@ type BuildResult struct {
 
 	// Failed is why, when it did.
 	Failed string `json:"failed,omitempty"`
+
+	// Source is the request's, echoed: the seat form of the repository, for whoever registers.
+	Source *SourceOnSeat `json:"source,omitempty"`
 }
 
 // ReadRepository is a repository a build read source from besides the module's own, at the branch,