fix: align forge user email to git user.email so commits link to profiles

agent users were created with {name}@hive.local but git commits use
{name}@hyperhive (set by meta::render_flake). forgejo matches by email,
so no profile link appeared on any commit.

- extract agent_email() helper returning {name}@hyperhive
- use it in ensure_user_exists (new users)
- add ensure_user_email() that runs gitea admin user edit to patch
  existing users; called from ensure_all on every startup sweep

Closes #64

hive-c0re/src/forge.rs

@@ -131,6 +131,13 @@ fn extract_token(output: &str) -> Option<String> {
         .map(str::to_owned)
 }
 
+/// Canonical email address for a hive agent's Forgejo account.
+/// Must match the `user.email` set by `meta::render_flake` so commits
+/// by the agent link back to their Forgejo profile page.
+fn agent_email(name: &str) -> String {
+    format!("{name}@hyperhive")
+}
+
 /// Ensure a forgejo user named `name` exists. Idempotent: forgejo
 /// returns a "user already exists" error which we treat as success.
 /// `admin` adds `--admin` (site admin) — used for the bootstrap
@@ -143,7 +150,7 @@ async fn ensure_user_exists(name: &str, admin: bool) -> Result<()> {
         name,
         "--email",
     ];
-    let email = format!("{name}@hive.local");
+    let email = agent_email(name);
     args.push(&email);
     args.extend(["--random-password", "--must-change-password=false"]);
     if admin {
@@ -171,6 +178,18 @@ async fn ensure_user_exists(name: &str, admin: bool) -> Result<()> {
     }
 }
 
+/// Idempotently align the Forgejo account email to `agent_email(name)`.
+/// Existing agents were created with `{name}@hive.local`; this corrects
+/// that so git commits (which use `{name}@hyperhive`) link to profiles.
+/// Best-effort: failures are warned, not propagated.
+async fn ensure_user_email(name: &str) {
+    let email = agent_email(name);
+    match forge_admin(&["user", "edit", "--username", name, "--email", &email]).await {
+        Ok(_) => tracing::debug!(%name, %email, "forge: user email aligned"),
+        Err(e) => tracing::warn!(%name, error = %e, "forge: could not align user email"),
+    }
+}
+
 /// Mint a fresh access token for `name` and persist it to
 /// `<state>/forge-token` (0600). Token name is suffixed with a
 /// monotonic clock so re-issuing doesn't collide with an existing
@@ -496,6 +515,10 @@ pub async fn ensure_all() {
         if let Err(e) = ensure_user_for(&name).await {
             tracing::warn!(%name, error = ?e, "forge: ensure_user failed");
         }
+        // Align email to match the git user.email set by meta::render_flake
+        // so commits link to the agent's Forgejo profile. Best-effort;
+        // also patches up agents created before this fix (old @hive.local).
+        ensure_user_email(&name).await;
         // Mirror the agent's applied config repo into agent-configs.
         // ensure_config_repo is idempotent; push_config catches any
         // drift since the last run — e.g. the startup migration just