Work with nested tl files

[FourierTransformer]

Ran into this while attempting to add tested to a larger Teal project. It likely should've been caught a lot earlier, but so it goes.

AI Disclosure: I did use AI to help debug and troubleshoot this.

closes #31

[FourierTransformer]

and it looks like lanes is now broken...

Run tested -c
/home/runner/work/tested/tested/lua_install/bin/lua: ...rk/tested/tested/lua_install/share/lua/5.1/lanes.lua:341: main: function 'package/loaded/compat53.string/pack' not found in Lane #0x55e103ea4840 destination transfer database.
stack traceback:
	[C]: in function 'core_lane_new'
	...rk/tested/tested/lua_install/share/lua/5.1/lanes.lua:341: in function 'worker_lane'
	.../lua_install/share/lua/5.1/tested/libs/ThreadPool.tl:90: in function 'init'
	...sted/lua_install/share/lua/5.1/tested/test_runner.tl:119: in function 'run_parallel_tests'
	...ted/tested/lua_install/share/lua/5.1/tested/main.lua:263: in function 'run_tests'
	...ted/tested/lua_install/share/lua/5.1/tested/main.lua:288: in function 'main'
	...ted/tested/lua_install/share/lua/5.1/tested/main.lua:300: in main chunk
	[C]: in function 'require'
	...stall/lib/luarocks/rocks-5.1/tested/dev-1/bin/tested:2: in main chunk
	[C]: ?
tested v0.1.0  tests

Will have to look into this.

[FourierTransformer]

Took a minute, but got this issues resolved.