Clarify native preview reporting and cancellation ownership

docs/roadmap/promptkit-v0.20.0.md

@@ -256,7 +256,8 @@ no CommandKit wrappers or CLI commands for those construction conveniences.
 [OD-2](#od-2-request-controls-and-provider-parameter-grammar) owns reusable flag
 collections, aliases, input forms, and precedence. Expose preview as an independent
 capability alongside existing suite callbacks. Call `Engine.Prepare` once and
-project its snapshot; a preliminary `ValidateRequest` call is unnecessary.
+hand its native snapshot to core under OD-1; a preliminary `ValidateRequest`
+call is unnecessary.
 Upstream excludes resolved credentials from prepared settings, but rendered
 application content is not a redacted configuration report.
 
@@ -409,6 +410,14 @@ the existing Reporter lifecycle for visibility, destinations, delivery, and
 presentation failures, preserving domain outcomes and causes. This extends the
 existing reporting facility rather than creating a second delivery lifecycle.
 
+Integration handlers decide whether cancellation stops report submission or
+whether already-acquired evidence should still be reported. Core renders the
+submitted content through its ordinary visibility and presentation-failure
+lifecycle; do not introduce a blanket invocation-cancellation check that discards
+such evidence. Ordinary inspection can stop before submission, while smoke
+reports and OD-6 aggregate validation preserve available evidence after
+cancellation. This does not resume canceled acquisition or execution work.
+
 ### Agreed shared representation rules
 
 **Agreed:** use Go's standard `encoding/json` serialization conventions to
@@ -745,6 +754,9 @@ rather than prescribing one test per line or exact cosmetic snapshots.
 - [ ] Invocation and writer APIs share rendering; quiet mode, domain outcomes,
   cause identity, cancellation, and presentation failures retain their agreed
   lifecycle. Changing format does not change selected content or detail level.
+  Cover handler-selected submission after cancellation for acquired smoke and
+  aggregate-validation evidence, without imposing that behavior on ordinary
+  inspection or restarting canceled work.
 - [ ] Every path in the [output inventory](#output-implementation-inventory) is
   reviewed. Remove obsolete per-command format plumbing and duplicate encoders;
   preserve explicit raw output, help, and diagnostic boundaries.
@@ -768,8 +780,9 @@ rather than prescribing one test per line or exact cosmetic snapshots.
   native unknown facts, supported causes, and outcomes, including no-report cases.
   Smoke aggregation preserves ordered results and partial failure/cancellation
   evidence in one report. Default tests need no live credentials or model calls.
-- [ ] OD-1 preview forwards the request, calls preparation once, and projects
+- [ ] OD-1 preview forwards the request, calls preparation once, and hands native
-  native evidence without a model call or retained execution handle. Help explains
+  `PreparedRun` data to core unless a concrete presentation need warrants a small
+  projection. It makes no model call and retains no execution handle. Help explains
   the prompt-ID argument, resource I/O, and rendered-content disclosure.
 - [ ] OD-2 collections work in standard and application-owned commands with their
   own typed inputs. Preserve selected subsets, omission/empty/zero values,
@@ -878,8 +891,11 @@ upstream fields selected under [resource inspection](#resource-inspection).
 
 ### OD-1: Preview command and report presentation
 
-**Agreed:** use `promptkit show prepared PROMPT_ID` with the complete relevant
+**Agreed:** use `promptkit show prepared PROMPT_ID` with the native `PreparedRun`
-`PreparedRun` projection. The structured mapping, without a dedicated text
+handed directly to core. Its existing JSON serialization fields cover the selected
+report content. Introduce a small projection only for a concrete presentation
+requirement; do not maintain a parallel report structure merely to copy those
+fields. The structured mapping, without a dedicated text
 template, selects YAML through core's automatic policy. Universal format choices
 and automatic selection supersede both the earlier YAML-only restriction and
 the command-specific default proposal. The argument names
@@ -1254,6 +1270,12 @@ results and available evidence from the failing scope. Do not claim unvisited sc
 were validated. Apply the same aggregation to concise and detailed modes, using
 one ordinary report value and the shared renderers, including one JSON document.
 
+The validation handler submits that acquired evidence even when cancellation
+stopped acquisition, following the
+[shared reporting cancellation boundary](#agreed-format-independent-reporting-operation).
+Do not reuse an ordinary inspection helper's cancellation guard to suppress this
+report. Preserve the cancellation outcome alongside any presentation failure.
+
 This deliberately changes delivery timing: scope results are no longer written
 one at a time during acquisition. Output failures are observed after acquisition
 has stopped and cannot prevent already-completed loads. Preserve the original