hive-forge: rewrite bash CLI helper as a rust binary (closes #280)

CLAUDE.md

@@ -149,6 +149,18 @@ hive-ag3nt/        in-container harness crate; produces TWO binaries
                           manager.md — manager system prompt
                           claude-settings.json — --settings JSON
 
+hive-forge/        Forgejo CLI wrapper (`hive-forge` binary)
+  src/main.rs           clap dispatch over the verbs/
+  src/client.rs         blocking reqwest client (Forgejo REST API)
+  src/body.rs           body input resolution (--body / --body-file / piped stdin)
+  src/verbs/<verb>.rs   one module per verb (view, issue, pr, comment,
+                         comment-show, comment-edit, issue-create,
+                         issue-edit, pr-create, pr-reviews, assign,
+                         close, labels, milestone, branches,
+                         tree-sha, diff, subscription, attach-issue,
+                         attach-comment). Replaces the 600-line
+                         hive-forge-tools.nix bash script (closes #280).
+
 hive-sh4re/        wire types (HostRequest/Response, AgentRequest/Response,
                    ManagerRequest/Response, Message, Approval, HelperEvent)