ensure `enable` doesn't miss newly-added scripts

and add some more documentation

docs/dev/Lua API.rst

@@ -5574,9 +5574,9 @@ Example usage::
         end
     end
 
-If the state of your script is tied to the active savegame, then your script
-should hook the appropriate events to load persisted state when the savegame is
-reloaded. For example::
+If the state of your script can be tied to an active savegame, then your script
+should hook the appropriate events to load persisted state when a savegame is
+loaded. For example::
 
     local json = require('json')
     local persist = require('persist-table')
@@ -5597,6 +5597,15 @@ outside of any function. DFHack will load your script as a module just before
 the ``SC_DFHACK_INITIALIZED`` state change event is sent, giving your code an
 opportunity to run and attach hooks before the game is loaded.
 
+If an enableable script is added to a DFHack `script path <script-paths>` while
+DF is running, then it will miss the initial sweep that loads all the module
+scripts and any ``onStateChange`` handlers the script may want to register will
+not be registered until the script is loaded via some means, either by running
+it or loading it as a module. If you just added new scripts that you want to
+load so they can attach their ``onStateChange`` handlers, run ``enable`` without
+parameters or call ``:lua require('script-manager').reload()`` to scan and load
+all script modules.
+
 Save init script
 ================
 

library/lua/script-manager.lua

@@ -45,6 +45,9 @@ function reload()
 end
 
 function list()
+    -- call reload every time we list to make sure we get scripts that have
+    -- just been added
+    reload()
     for name,fn in pairs(enabled_map) do
         print(('%20s\t%-3s'):format(name..':', fn() and 'on' or 'off'))
     end