chore(deps): bump husky to ^9.1.7 and drop migration plan file

- Remove `.claude/plans/migrate-to-yarn-4.md` -- the plan was useful
  during the migration but doesn't need to live in the repo.

- Bump husky 6.0.0 -> 9.1.7. The v9 hooks layout sets core.hooksPath
  to `.husky/_/` (not `.husky/`), with auto-generated stubs in that
  directory routing each hook to the user-authored counterpart at
  `.husky/<hook>`. The user hook files no longer need the
  `#!/bin/sh` + `. "$(dirname "$0")/_/husky.sh"` boilerplate; in v9
  that boilerplate emits a deprecation warning and is slated to
  break in v10. Trimmed those two lines from `.husky/pre-commit` and
  `.husky/commit-msg`, and deduped the accidental double commitlint
  invocation in `.husky/commit-msg` while there.

- Update the core SDK workspace's postinstall to invoke the v9
  binary path (`node_modules/husky/bin.js` -- the `install` subcommand
  is gone in v9; running the binary with no args performs the same
  setup).

Author: oliverlaz

.claude/plans/migrate-to-yarn-4.md

@@ -1,5 +1 @@
-#!/bin/sh
-. "$(dirname "$0")/_/husky.sh"
-
-npx commitlint --edit $1
 npx commitlint --edit $1

.husky/commit-msg

@@ -1,4 +1 @@
-#!/bin/sh
-. "$(dirname "$0")/_/husky.sh"
-
 dotgit/hooks/pre-commit-format.sh && dotgit/hooks/pre-commit-reject-binaries.py

.husky/pre-commit

@@ -40,7 +40,7 @@
     "@semantic-release/git": "^10.0.1",
     "dotenv": "^10.0.0",
     "execa": "^5.1.1",
-    "husky": "^6.0.0",
+    "husky": "^9.1.7",
     "prettier": "^3.5.1",
     "semantic-release": "^25.0.2",
     "uglify-js": "^3.19.2"

package.json

@@ -23,7 +23,7 @@
     "README.md"
   ],
   "scripts": {
-    "postinstall": "(cd .. && node node_modules/husky/lib/bin.js install) && yarn run shared-native:sync",
+    "postinstall": "(cd .. && node node_modules/husky/bin.js) && yarn run shared-native:sync",
     "shared-native:sync": "bash ./scripts/sync-shared-native.sh all",
     "shared-native:clean-copies": "bash ./scripts/clean-shared-native-copies.sh all",
     "build": "rimraf lib && yarn run --silent build-translations && bob build && yarn run --silent copy-translations",

package/package.json

@@ -14727,12 +14727,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"husky@npm:^6.0.0":
-  version: 6.0.0
-  resolution: "husky@npm:6.0.0"
+"husky@npm:^9.1.7":
+  version: 9.1.7
+  resolution: "husky@npm:9.1.7"
   bin:
-    husky: lib/bin.js
-  checksum: 10c0/00dca95e24f6174f150ba1ee746948a89a3ff20b460ecad7bc2e4c2a76fe5b78bef1400c84bc2bade6588392c37baf57c173f49dc123fdbc7c7a71e4d412fb67
+    husky: bin.js
+  checksum: 10c0/35bb110a71086c48906aa7cd3ed4913fb913823715359d65e32e0b964cb1e255593b0ae8014a5005c66a68e6fa66c38dcfa8056dbbdfb8b0187c0ffe7ee3a58f
   languageName: node
   linkType: hard
 
@@ -21921,7 +21921,7 @@ __metadata:
     "@semantic-release/git": "npm:^10.0.1"
     dotenv: "npm:^10.0.0"
     execa: "npm:^5.1.1"
-    husky: "npm:^6.0.0"
+    husky: "npm:^9.1.7"
     prettier: "npm:^3.5.1"
     semantic-release: "npm:^25.0.2"
     uglify-js: "npm:^3.19.2"