Complete stateless execution remediation

docs/roadmap/implementation.md

@@ -1,18 +1,16 @@
 # Stateless Execution Implementation Plan
 
-Status: Ready for remediation implementation (Stages 14-18).
+Status: Complete.
 
 ## Purpose
 
 This plan implements the accepted [Stateless Execution
 Roadmap](ephemeral-state.md). The roadmap is authoritative for product intent,
 policy choices, and the desired end state. This document records the completed
-migration and defines the remaining remediation work discovered during
-post-implementation review.
+migration and records the remediation work completed during post-implementation
+review.
 
-Stages 1-13 are complete and are summarized below. Implement Stages 14-18 in
-numeric order. Each remaining stage is intentionally scoped for one focused
-implementation prompt.
+Stages 1-18 are complete and are summarized below.
 
 ## Implementation Rules
 
@@ -130,7 +128,7 @@ historical inspection.
 Ran the complete offline test, race, vet, build, help, formatting, stale-string,
 and documentation review gates and marked the initial migration implemented.
 
-## Stage 14: Prevent Publication After Cancellation
+## Stage 14: Prevent Publication After Cancellation — Complete
 
 ### Goal
 
@@ -174,7 +172,7 @@ git diff --check
 Cancellation observable before publication prevents the atomic write, the
 selected destination remains unchanged, and cancellation identity is retained.
 
-## Stage 15: Preflight Every Planned Batch Output
+## Stage 15: Preflight Every Planned Batch Output — Complete
 
 ### Goal
 
@@ -222,7 +220,7 @@ git diff --check
 Every selected batch destination is validated before any batch report executes,
 and a destination collision cannot yield an unreported partial batch.
 
-## Stage 16: Separate Report Counts From Batch Notification Status
+## Stage 16: Separate Report Counts From Batch Notification Status — Complete
 
 ### Goal
 
@@ -273,7 +271,7 @@ Batch report counters are internally consistent, while notification failure
 still produces a failed summary, safe diagnostic, retained outputs, and
 non-zero command result.
 
-## Stage 17: Remove Impossible Per-Report Notification State
+## Stage 17: Remove Impossible Per-Report Notification State — Complete
 
 ### Goal
 
@@ -314,7 +312,7 @@ git diff --check
 Batch items expose only report-generation facts, and all batch delivery state
 is represented by the single top-level notification result.
 
-## Stage 18: Reconcile Documentation And Run The Remediation Exit Gate
+## Stage 18: Reconcile Documentation And Run The Remediation Exit Gate — Complete
 
 ### Goal