docs(#1970): rewrite for UI-driven shape (github.enable + host switch), purge githubAccount refs, regen hivectl-cli.md

hive-sh4re/src/priv_proto.rs

@@ -414,7 +414,8 @@ pub enum PrivRequest {
     /// Write `github-token` into `AGENT_STATE_ROOT/<agent_name>/state/github-token`.
     ///
     /// The operator-supplied GitHub personal access token (PAT) for the
-    /// agent's `hyperhive.githubAccount`. Same write semantics as
+    /// agent's GitHub integration (`hyperhive.github.enable`). Same write
+    /// semantics as
     /// `WriteAgentForgeToken` — validates `agent_name`, creates the state dir
     /// if absent, writes the file 0600, and chowns it to the agent so the
     /// `gh` wrapper / git credential helper can read it. No account suffix