refactor: unify GATEWAY_SECRET + DASHBOARD_API_KEY into WORKFLOW_DASHBOARD_SECRET

.env.example

@@ -14,7 +14,10 @@ WORKFLOW_CURSOR_MODEL=
 # Timeout in milliseconds for Cursor agent operations
 WORKFLOW_CURSOR_TIMEOUT=
 
-# ── Hermes Agent (used by workflow-template-solve-issue) ──
+# ── Hermes Agent (used by develop tester/committer + solve-issue) ──
+
+# CLI command to invoke the Hermes agent (absolute path required)
+WORKFLOW_HERMES_COMMAND=
 
 # Model override for Hermes agent
 WORKFLOW_HERMES_MODEL=
@@ -29,7 +32,7 @@ WORKFLOW_HERMES_TIMEOUT=
 WORKFLOW_STORAGE_ROOT=
 
 # Gateway secret for the serve command
-WORKFLOW_GATEWAY_SECRET=
+WORKFLOW_DASHBOARD_SECRET=
 
 # ── Display ──