fix(scripts): repair clean.mts imports + drop dead minify validator

clean.mts crashed on first import (ERR_PACKAGE_PATH_NOT_EXPORTED): it
pulled safeDelete from @socketsecurity/lib/fs (no such export),
getDefaultLogger from @socketsecurity/lib/logger, and REPO_ROOT from a
non-existent ./paths.mts. Repoint at the canonical -stable subpaths
(@socketsecurity/lib-stable/fs/safe, .../logger/default) and
./fleet/paths.mts so `pnpm run clean` runs again.

Delete scripts/validate-esbuild-minify.mts: an orphan from the
esbuild->rolldown bundler migration. It imported a non-existent
.config/esbuild.config.mts, and its catch block set exitCode=1 while
main() overwrote it to 0 — so it always reported "passed" and could
never catch a real minify regression. Not wired into any package.json
script or CI gate; the rolldown validator supersedes it.

Author: jdalton

scripts/clean.mts

@@ -1,7 +1,7 @@
 /**
  * @fileoverview Clean derived directories.
  *
- * Routes deletion through `safeDelete` from `@socketsecurity/lib/fs`
+ * Routes deletion through `safeDelete` from `@socketsecurity/lib-stable/fs/safe`
  * per the fleet's "no `rm -rf` direct calls" rule (CLAUDE.md
  * Code-style section).
  *
@@ -11,10 +11,10 @@
 import { glob } from 'node:fs/promises'
 import path from 'node:path'
 
-import { safeDelete } from '@socketsecurity/lib/fs'
-import { getDefaultLogger } from '@socketsecurity/lib/logger'
+import { safeDelete } from '@socketsecurity/lib-stable/fs/safe'
+import { getDefaultLogger } from '@socketsecurity/lib-stable/logger/default'
 
-import { REPO_ROOT } from './paths.mts'
+import { REPO_ROOT } from './fleet/paths.mts'
 
 const logger = getDefaultLogger()