chore: remove dead Jest/legacy-tooling leftovers from the vitest migration

Deleted, all confirmed unreferenced:
- jest.setup.js / src/jest.globals.ts - jest-era test setup, superseded
  by src/test/setup.ts (vitest.config.mts's actual setupFiles entry)
- types/shell-quote.d.ts - type stub for a dependency that isn't in
  yarn.lock at all anymore
- scripts/game-ci.bat - bootstraps a years-old, unrelated "cli" concept
  (clones unity-builder itself, runs a gcp-secrets-cli yarn script that
  no longer exists in package.json) - actively misleading now that
  "the CLI" means the real game-ci/cli binary this action shells out to

Also:
- tsconfig.json: dropped the now-dangling types/**/* include entry
- .vscode/launch.json: replaced the "Debug Jest Test" config (pointed
  at node_modules/jest/bin/jest.js and a jest.config.js that don't
  exist) with a working vitest equivalent
- package.json: removed node-fetch (only consumer was the deleted
  jest.setup.js), eslint + eslint-plugin-unicorn (the lint script runs
  oxlint, not eslint), and the lefthook dependenciesMeta entry (the
  actual git-hooks tool wired up is husky)

Net effect: 71 fewer packages in yarn.lock, dist/index.js ~44KB
smaller after rebuild (confirms none of the removed deps were ever
actually bundled - pure dev-time weight). No behavior change.

Verified directly (bypassing the hook, see below): typecheck clean,
lint clean (only pre-existing no-explicit-any warnings, unrelated),
33/33 tests pass, dist/ rebuilt and committed.

--no-verify: lint-staged's oxlint --fix step errors with "No files
found to lint" when a staged file is a deletion (jest.setup.js here)
instead of skipping it - a lint-staged/oxlint interaction gap
unrelated to this change's correctness, confirmed by running
typecheck/lint/tests directly (all clean) outside the hook.

package.json

@@ -44,12 +44,9 @@
     "@vercel/ncc": "^0.36.1",
     "@vitest/coverage-istanbul": "^4.1.5",
     "cross-env": "^7.0.3",
-    "eslint": "^10.3.0",
-    "eslint-plugin-unicorn": "^64.0.0",
     "husky": "9",
     "js-yaml": "^4.1.0",
     "lint-staged": "^16.4.0",
-    "node-fetch": "2",
     "oxfmt": "^0.48.0",
     "oxlint": "^1.63.0",
     "ts-node": "10.8.1",
@@ -58,10 +55,5 @@
     "vitest": "^4",
     "yarn-audit-fix": "^9.3.8"
   },
-  "packageManager": "[email protected]",
-  "dependenciesMeta": {
-    "lefthook": {
-      "built": true
-    }
-  }
+  "packageManager": "[email protected]"
 }