Mark cleanup roadmap stages as implemented

docs/roadmap/cleanup.md

@@ -1,6 +1,6 @@
 # Roadmap: Pre-1.0 Code Cleanup
 
-Status: Planned
+Status: Implemented
 
 This roadmap turns the remaining findings in `docs/roadmap/audit.md` into decision-complete implementation stages. It follows the policy documents under `docs/policy/` and preserves current public CLI, config, storage layout, manifest, and stage behavior unless a stage explicitly says otherwise.
 
@@ -22,7 +22,7 @@ This roadmap turns the remaining findings in `docs/roadmap/audit.md` into decisi
 - Do not add compatibility aliases for retired archive/promote, campaign, transcript, or previous-session source names.
 - Do not move restore's remote-key include/exclude policy out of restore unless another caller is added.
 
-## Stage 1: Path and File Mechanics
+## Stage 1: Path and File Mechanics (Implemented)
 
 Add shared mechanics for root-scoped path safety and atomic file operations.
 
@@ -64,7 +64,7 @@ Acceptance criteria:
 - Atomic helper tests prove temp files are cleaned up on failure and checksums match final file contents.
 - Restore, prepare, and audio cache behavior remain unchanged.
 
-## Stage 2: Artifact Source Policy
+## Stage 2: Artifact Source Policy (Implemented)
 
 Finish centralizing artifact source vocabulary and validation in `internal/artifactpolicy`.
 
@@ -103,7 +103,7 @@ Acceptance criteria:
 - Analyze behavior for required/optional built-in, configured, and previous-session sources is unchanged.
 - Previous-cache candidate ordering and required/optional behavior are unchanged.
 
-## Stage 3: Read-Only Inspection Layer
+## Stage 3: Read-Only Inspection Layer (Implemented)
 
 Extract shared read-only session inspection checks for `session validate` and `session status`.
 
@@ -137,7 +137,7 @@ Acceptance criteria:
 - Missing current run pointer/manifest behavior remains command-appropriate: validation reports an error; status reports unavailable state.
 - Existing lock and remote current-state behavior is unchanged.
 
-## Stage 4: Optional CLI Edge Cleanup
+## Stage 4: Optional CLI Edge Cleanup (Implemented)
 
 Only implement this stage if Stage 1-3 leave meaningful repeated parser code.
 
@@ -159,7 +159,7 @@ Acceptance criteria:
 - Missing source arguments for lock add/remove remain clear.
 - No new command aliases are introduced.
 
-## Stage 5: Final Sweep
+## Stage 5: Final Sweep (Implemented)
 
 Run final validation after the implementation stages.