fix(core): Restore utils.ts disable and fix lint script to reject all errors

- Restore oxlint-disable for no-unsafe-member-access in plugin/utils.ts
  (tsgolint false positive: types `fs` as `error` with SUPPRESS_DIAGNOSTICS)
- Fix lint:oxlint grep pattern from [01] to 0 so it no longer silently
  accepts 1 genuine lint error

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: antonis

packages/core/package.json

@@ -41,7 +41,7 @@
     "fix:oxlint": "OXLINT_TSGOLINT_DANGEROUSLY_SUPPRESS_PROGRAM_DIAGNOSTICS=true oxlint --type-aware --tsconfig tsconfig.lint.json --fix",
     "fix:prettier": "prettier  --config ../../.prettierrc.json --ignore-path ../../.prettierignore  --write \"{src,test,scripts,plugin/src}/**/**.ts\"",
     "lint": "npx run-s lint:oxlint lint:prettier",
-    "lint:oxlint": "sh -c 'OUT=$(OXLINT_TSGOLINT_DANGEROUSLY_SUPPRESS_PROGRAM_DIAGNOSTICS=true oxlint --type-aware --tsconfig tsconfig.lint.json --deny-warnings 2>&1); echo \"$OUT\"; echo \"$OUT\" | grep -qE \"Found 0 warnings and [01] error\"'",
+    "lint:oxlint": "sh -c 'OUT=$(OXLINT_TSGOLINT_DANGEROUSLY_SUPPRESS_PROGRAM_DIAGNOSTICS=true oxlint --type-aware --tsconfig tsconfig.lint.json --deny-warnings 2>&1); echo \"$OUT\"; echo \"$OUT\" | grep -qE \"Found 0 warnings and 0 errors\"'",
     "lint:prettier": "prettier  --config ../../.prettierrc.json --ignore-path ../../.prettierignore --check \"{src,test,scripts,plugin/src}/**/**.ts\""
   },
   "bin": {

packages/core/plugin/src/utils.ts

@@ -1,3 +1,5 @@
+// tsgolint incorrectly types `fs` as `error` — false positive with DANGEROUSLY_SUPPRESS_PROGRAM_DIAGNOSTICS
+/* oxlint-disable typescript-eslint(no-unsafe-member-access) */
 import * as fs from 'fs';
 import * as path from 'path';
 import { warnOnce } from './logger';