Drop the deprecated @types/libsodium-wrappers-sumo stub (closes #27)

The package is an empty stub with no declarations; libsodium-wrappers-sumo
ships its own types. Removed with yarn remove, which regenerated yarn.lock.

Model: opus-5-5

TODO.md

@@ -18,6 +18,9 @@ Tag v1.0.0.
 
 # Completed Steps
 
+- 2026-09-22: Dropped the deprecated `@types/libsodium-wrappers-sumo` stub from
+  `devDependencies` (issue 27). It shipped no declarations; the types come from
+  `libsodium-wrappers-sumo` itself. `yarn.lock` regenerated by `yarn remove`.
 - 2026-09-22: Hardened the client session lifecycle (issue 10).
   `Client.fromJSON` checks every snapshot field and each key's decoded length
   and names the bad field; `toJSON` reads the token through

package.json

@@ -29,7 +29,6 @@
     },
     "devDependencies": {
         "@eslint/js": "9.38.0",
-        "@types/libsodium-wrappers-sumo": "0.8.2",
         "@types/node": "22.18.13",
         "eslint": "9.38.0",
         "prettier": "3.8.1",

yarn.lock

@@ -528,13 +528,6 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.15.tgz#596a1747233694d50f6ad8a7869fcb6f56cf5841"
   integrity sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==
 
-"@types/libsodium-wrappers-sumo@0.8.2":
-  version "0.8.2"
-  resolved "https://registry.yarnpkg.com/@types/libsodium-wrappers-sumo/-/libsodium-wrappers-sumo-0.8.2.tgz#488e8747fbb982fe901020b5afeaddfa63da6830"
-  integrity sha512-uFOBpg/r21hExVlh2ty8YpDfSR+Yy3Jn8XS4+SSjitbhTxdYq+pBz/49XRxyUFe8SzqujHf/Wu0/O4d+FUtNfQ==
-  dependencies:
-    libsodium-wrappers-sumo "*"
-
 "@types/node@22.18.13":
   version "22.18.13"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-22.18.13.tgz#a037c4f474b860be660e05dbe92a9ef945472e28"
@@ -1249,7 +1242,7 @@ libsodium-sumo@^0.8.0:
   resolved "https://registry.yarnpkg.com/libsodium-sumo/-/libsodium-sumo-0.8.4.tgz#6d4687781fa0ad398af14a7df872d5c27cf8cd31"
   integrity sha512-TMtHShQfVVsaxDygyapvUC3o7YsPgXa/hRWeIgzyFz6w5k/1hirGptCxp1U7XwW3rCskaTTYKgV10v86UiGgNw==
 
-libsodium-wrappers-sumo@*, libsodium-wrappers-sumo@0.8.4:
+libsodium-wrappers-sumo@0.8.4:
   version "0.8.4"
   resolved "https://registry.yarnpkg.com/libsodium-wrappers-sumo/-/libsodium-wrappers-sumo-0.8.4.tgz#6656a3e7e0551ecce08ddee4bfb501a092eac6fa"
   integrity sha512-ql7hcgulKZ3ekfa2DGAogcCKsWU0diA/0nArz1CFzh93WQdb46/Kj18ka/Hifq6uA3Ush34Pc6vU/6HXeRwUkg==