Honor explicit report directory for file output

docs/roadmap/implementation.md

@@ -1,7 +1,7 @@
 # Implementation Plan: Independent Output Destinations
 
 **Last updated:** 2026-10-03
-**Status:** Ready for implementation.
+**Status:** Stage 1 complete; Stage 2 pending.
 **Audience:** gpt-5.6-terra coding agent.
 
 ## Scope and Execution
@@ -52,6 +52,8 @@ before report initialization remain outside that guarantee.
 
 ## Stage 1 — Implement Explicit Report-Destination Selection
 
+**Completion:** Complete — targeted CLI and subprocess tests pass; reviewed diff and whitespace checks.
+
 **Files:** `internal/cli/config_input.go`, `internal/cli/process.go`,
 `internal/cli/run.go`, `internal/cli/config_input_test.go`, and the existing
 affected subprocess test in `cmd/audita/main_integration_test.go`.