add reviewer assigning

README.md

@@ -70,7 +70,8 @@ When GitHub reports that the authenticated user has permission, diple can:
 
 - reply to review threads;
 - resolve and unresolve review threads;
-- edit the PR title, Markdown description, and target branch;
+- edit the PR title, Markdown description, target branch, requested reviewers,
+  and assignees;
 - enable or disable auto-merge; and
 - merge immediately when the PR is eligible.
 
@@ -78,8 +79,8 @@ The UI explains unavailable actions through its write-capability gate.
 Metadata and reply drafts are persisted locally so cancellation or a restart
 does not silently discard work.
 
-Reactions are currently read-only. Assigning reviewers, assignees, labels, or
-milestones is not implemented yet.
+Reactions are currently read-only. Assigning labels or milestones is not
+implemented yet.
 
 ## Requirements
 
@@ -197,7 +198,13 @@ reference.
 The PR description editor defaults to Vim-style modal editing, including
 Normal, Insert, and Visual modes, word/find motions, deletion, system clipboard
 yank/paste, and soft-wrap-aware movement. Set `editing.mode = "standard"` for a
-non-modal editor. Target-branch completion uses `ctrl+n` and `ctrl+p`.
+non-modal editor. Target-branch, reviewer, and assignee completion use
+`ctrl+n` and `ctrl+p`; reviewer and assignee fields accept comma-separated
+GitHub usernames. Current reviewers and assignees are prefilled and marked in
+completion results. Reviewer suggestions prioritize recent contributors using
+the latest 100 commits on the repository's default branch; this bounded window
+is also shown in the editor. Every change is shown in the existing confirmation
+screen before GitHub is updated.
 
 ## Configuration