Classify recovery setup failures by their actual cause

docs/roadmap/remediation.md

@@ -694,6 +694,12 @@ no-recovery-step behavior for successful publication.
 
 ## R16: Classify endpoint setup failures by their actual cause — P3
 
+**Completed:** The Git boundary marks configuration-read/resolution failures;
+observation maps those, positive rewrites, and other operational errors to the
+existing kinds while preserving causes. Named/unnamed malformed configuration,
+rewrite, tooling, cancellation, facade, and CLI diagnostic tests passed. Tests
+also verify no tag query after setup failure; Stage 1/6/8 guidance is updated.
+
 **Relevant code:** `internal/publish/reconcile.go:116–128` and
 `internal/git/remote.go`'s endpoint setup. Affects Stages 1 and 6.