Classify PromptKit asset and operator failures

docs/roadmap/implementation.md

@@ -1,7 +1,7 @@
 # Implementation Plan: PromptKit v0.12.0 Adoption
 
 **Last updated:** 2026-10-03
-**Status:** In progress; Stages 1–3 completed.
+**Status:** In progress; Stages 1–4 completed.
 **Audience:** Luna coding agent.
 
 ## Scope and Execution
@@ -253,6 +253,14 @@ startup path needs existing exit behavior preserved.
 `go test ./internal/cli`; check whitespace and commit. Preserve the original
 failure cause where available rather than flattening it to a generic error.
 
+**Completion marker:** Stage 4 complete. Embedded discovery and construction
+failures are distinguished from operator inputs through an embedded-only
+diagnostic construction; cancellation skips that diagnostic. Selected-profile
+completeness and native directory validation are covered, and both config
+commands preserve exit 1 for cancellation/assets and exit 2 for invalid
+operator YAML, templates, and resources. Targeted runtime tests,
+`go test ./internal/cli`, and `git diff --check` passed.
+
 ## Stage 5 — Protect Consumed Configuration and Message Files
 
 **Primary files:** `internal/framework/llm/runtime.go` or a focused source-path