Drop lua-term since lua-system has the same functionality

[IlyasYOY]

Removed the lua-term as described here: #771 (comment)

• Ran just check, no new test failures. Seems like the change in the infrastructure layer where are no tests.
• Ran rg to search 'test in the code, no more entries found.
• Cloned colors.lua from lua-term to busted/outputHandlers/colors.lua. Mentioned it in docs. Kept it AS-IS, didn't change a thing. I might remove unused code if you think it'd be better.
• I didn't create a new rockspec, because that it's better be done before the release.

The only thing left to do is:

--- rockspecs/busted-2.3.0-1.rockspec	2026-06-02 14:59:47
+++ rockspecs/busted-2.3.1-1.rockspec	2026-06-02 17:59:25
@@ -1,5 +1,5 @@
 local package_name = "busted"
-local package_version = "2.3.0"
+local package_version = "2.3.1"
 local rockspec_revision = "1"
 local github_account_name = "lunarmodules"
 local github_repo_name = package_name
@@ -34,11 +34,10 @@
 dependencies = {
   'lua >= 5.1',
   'lua_cliargs >= 3.0',
-  'luasystem >= 0.2.0',
+  'luasystem >= 0.3.0',
   'dkjson >= 2.1.0',
   'say >= 1.4-1',
   'luassert >= 1.9.0-1',
-  'lua-term >= 0.1',
   'penlight >= 1.15.0',
   'mediator_lua >= 1.1.1',
 }

Closes: #771

---

I'm not sure about AI policy, so I write it here:

• commit messages are made using codex,
• everything else I did myself.

I'm eager to make more contributions after this one, so it'd be good to understand the AI-usage policy. I don't want to violate it.

[IlyasYOY]

Updated busted-scm-1.rockspec, now it's up-to-date with the implementation.

Checked the tests after reinstalling deps.

PS. There is luacov is missing, so the just check fails if I don't install it manually: luarocks --tree lua_modules install luacov, should we add luacov in test dependencies?