feat(command-test): migrate to test-lib (manifest.lib + run_tests) (Test-Opt Phase 3.5)

Per ADR-0037 Tests-as-Libs Convention. Renamed on Gitea + moved
locally. History preserved.

init.lua

@@ -4,7 +4,9 @@
 local command = require("lib-core.command")
 local T       = engine.test
 
-function init(ctx)
+local M = {}
+
+function M.run_tests(ctx)
     -- Mocked-Unit Helper: closure-state simulates a module's unit-state.
     local function make_unit(x0, y0, speed)
         local state = { x = x0, y = y0 }
@@ -85,3 +87,5 @@ function init(ctx)
     local ok2 = pcall(function() command.move_to({99999}, 0, 0) end)
     T.assert(not ok2, "move_to with unknown handle errors")
 end
+
+return M