Consolidate future work into docs/roadmap/future.md and remove completed roadmap docs

docs/roadmap/future.md

@@ -33,6 +33,21 @@ internal docs.
 - Resumable upload support.
 - Streaming upload protocols.
 
+## Destination State Repair
+
+- Unmanaged-file adoption workflow for destination state repair.
+- Digest-audit mode for managed destination outputs.
+- Explicit invalid-state repair workflow.
+- Whole-config state repair command.
+
+## Destination Retention And Pruning
+
+- One-off retention overrides for `prune`.
+- Automatic post-publish pruning.
+- Path/date parsing retention policies.
+- Group-level pruning by source publication.
+- Removal of empty state files.
+
 ## Destination Backends
 
 - GitHub Gist destination backend support.
@@ -68,6 +83,7 @@ internal docs.
 - Mutual TLS or other in-app identity mechanisms.
 - In-app TLS.
 - Public exposure defaults.
+- In-app upload rate limiting.
 - Browser UI.
 
 ## Boundaries
@@ -76,5 +92,12 @@ internal docs.
   contract.
 - Current upload status, queue, and idempotency state are memory-only.
 - Producers submit complete tar or gzip-compressed tar source bundles today.
+- Producers do not choose destination ids, destination paths, transforms, links,
+  publish policy, transfer policy, storage backends, reconciliation mode, state
+  mode, or retention policy through upload requests.
+- Source manifests remain free of routing, destination, transform, credential,
+  reconciliation, state, and retention data.
 - Public access policy, TLS termination, and rate limiting belong outside
   `distributor` unless a future implementation changes that boundary.
+- `distributor` is not a broad storage synchronization tool unless a future
+  implementation explicitly changes that non-goal.