fix: harden workspace manager drafts

.superpowers/sdd/2026-08-03-git-workspace-registry/task-9-report.md

@@ -38,3 +38,36 @@ exit 0
 
 `git diff --check` passed before commit. No workspace secret value, secret-file path, raw
 diagnostic body, publish call, import flow, or export flow was introduced.
+
+## Fix round 1
+
+### Root causes and fixes
+
+- The original duplicate proposal appended `-copy` and then truncated at 63 characters. For an
+  already-maximal ID, truncation could remove the suffix and reproduce the immutable source ID.
+  The proposal now reserves suffix space and falls back to a distinct `-2` suffix when a maximal
+  source already ends in `-copy`.
+- `dwh.timeout_ms` was rendered as a positive numeric field but was absent from the client
+  validation map. It now has the same immediate accessible error treatment as other numeric
+  fields, so a rejected save never reaches the manager’s saved-draft toast.
+- Registry status, workspace list, and selected-detail React Query failures were rendered as
+  loading, empty, or unselected states. Each now has a named alert and a retry control, distinct
+  from its corresponding loading and empty state.
+
+### TDD evidence
+
+- RED: max-length duplication retained the original 63-character ID; the timeout field produced
+  no alert; and each of the three failed queries had no accessible retry control.
+- GREEN: the focused manager/editor tests passed **12/12**, covering a valid changed duplicate
+  proposal, rejected zero timeout with no save toast, and status/list/detail retry recovery.
+
+### Verification
+
+Executed from `frontend/`:
+
+```text
+npx vitest run
+50 test files passed, 364 tests passed
+npx tsc -b
+exit 0
+```