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

docs/roadmap/implementation.md

@@ -1,67 +0,0 @@
-# Reconciliation, Shared-Root, Reconcile-State, And Prune Status
-
-This roadmap file tracks the status and remaining boundaries for the feature
-group that includes destination reconciliation, shared-root destination state,
-state repair, and managed-output pruning.
-
-Current behavior is documented in:
-
-- `docs/config.md`
-- `docs/cli.md`
-- `docs/operations.md`
-- `docs/troubleshooting.md`
-- `docs/integrations/destination-state.md`
-- `docs/internal/app.md`
-- `docs/internal/publish.md`
-- `docs/internal/state.md`
-- `docs/internal/storage.md`
-
-## Current Scope
-
-Current scope includes:
-
-- destination `reconciliation.mode: replace|merge`;
-- destination `state.mode: single_owner|shared_root`;
-- schema version `2` single-owner destination state;
-- schema version `3` shared-root destination state;
-- owner-scoped shared-root publishing;
-- `reconcile-state` for removing missing managed-output records from valid
-  destination state;
-- destination `retention.prune` policy with `older_than` and `keep_latest`;
-- `prune --dry-run` and `prune --apply` for configured managed-output pruning.
-
-## Current Boundaries
-
-- Producer manifests and upload requests do not carry destination routing,
-  reconciliation, state mode, retention, transform, link, or backend policy.
-- Reconcile-state repairs state records only. It does not adopt unmanaged
-  files, validate output digests, repair invalid JSON, or reconcile an entire
-  config at once.
-- Pruning is explicit operator action. It does not run automatically after
-  publish and does not accept one-off retention overrides.
-- Pruning deletes only managed output paths recorded in destination state. It
-  does not delete unmanaged content or `.distributor.json`.
-- Shared-root publishing preserves unrelated owners and rejects implicit
-  takeover of another owner path.
-
-## Deferred Work
-
-Deferred or future work belongs in the other roadmap files under
-`docs/roadmap/`. Current deferred items include:
-
-- unmanaged-file adoption workflow;
-- digest-audit mode for state repair;
-- whole-config state repair;
-- automatic post-publish pruning;
-- path/date parsing retention policies;
-- producer-facing retention, reconciliation, or destination routing APIs;
-- broad storage synchronization behavior.
-
-## Verification
-
-Before changing this feature group, run the focused tests for affected
-packages and finish with:
-
-```sh
-go test ./...
-```