Document configuration comparison behavior

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implement ConfigKit adoption and configuration comparison
 
-Status: implementation in progress; Stages 1–10 are complete.
+Status: implementation in progress; Stages 1–11 are complete.
 
 ## Scope and authority
 
@@ -545,9 +545,20 @@ canonical owners, while future/deferred work stays clearly separate.
    symbols. Keep accepted ADR decision text unchanged; presentation details
    remain in CLI/API owners rather than returning to ADRs.
 
-**Completion evidence:** current operator/API/consumer owners agree with the
-implemented behavior; no stale four-operation convenience claims, text-diff
-promises, or deferred markers for delivered ConfigKit comparison.
+**Completion evidence — complete:** ckconfig GoDoc now describes all five
+operations, paired input lifetimes, shared state, native records, diagnostics,
+and supported error identity. The ckconfig README, CLI reference, consumer guide,
+internal overview, development examples, and maintained example READMEs describe
+current ConfigKit comparison behavior. The CLI owner covers independent right
+inheritance and supplied presence, native effective-value semantics, reduced
+safe YAML categories, null/deletion, concealed regions, empty output, root
+ambiguity, diagnostics, and outcome delivery. The ConfigKit feature roadmap now
+records implementation status; the deferred record no longer carries ConfigKit
+comparison as pending work and retains PromptKit comparison, independent per-side
+domain selectors, catalogs, and other unselected ideas. The accepted ADRs were
+left unchanged. Local Markdown targets/fragments and copied commands were
+reviewed; a local link check and `git diff --check -- '*.md'` passed. `go doc`
+was inspected for the exported comparison API.
 
 ## Stage 12: Reconcile manifests, notices, and pending integration release notes