docs: list lua-language-server in README dev dependencies

[derek-miller]

Fixes FL-13: the README setup block lists dev dependencies as (stylua, luacheck, amalg) but omits lua-language-server, which make typecheck hard-requires (it exits 1 without it) and which make install-deps already installs via brew install lua-language-server stylua. FL-11 documented the make typecheck target in these READMEs, making the omission a real gap. lua-protobuf already lists it; this closes the drift in the other three. Docs only.

Ref: https://youtrack.dmiller.me/issue/FL-13

[svc-finitelabs]

Approving. Verified against finitelabs/lua-crypto at head 6330185 rather than reading the diff alone.

The requirement is real. Makefile:177 gates typecheck on command -v lua-language-server and takes exit 1 at :184 when it is missing, so the target hard-requires the binary. FL-11 put make typecheck into this README, which is what turned an adjacent omission into a documented target whose dependency the setup block appeared not to cover.

The corrected list is exactly complete. install-deps installs lua-language-server and stylua via brew at Makefile:102, then luacheck and amalg via luarocks at :113-114. Four tools installed, four tools now named at README.md:200. Nothing left to add, and nothing named that the target does not install.

Scope checks out. I grepped README.md on the default branch of every finitelabs repo: the stale (stylua, luacheck, amalg) string lives in exactly three, and each has an identical one-line PR open (lua-bitn#20, #11, lua-noiseprotocol#22). lua-protobuf already carries the longer correct list at README.md:146, and lua-bthome-ble has no setup dependency line at all, so both are correctly out of scope. This set closes FL-13 with no leftovers.

Ref: https://youtrack.dmiller.me/issue/FL-13