chore: switch lint scripts from eslint to pickier

Per CLAUDE.md, pickier is the lint tool — not eslint. The lint /
lint:fix scripts and the lint-staged glob still called bunx eslint,
which pulled eslint from npm on every run. Swapped to
bunx --bun pickier so local lint matches the documented tool.
Refresh lockfile so the eslint package is no longer pinned.

Author: glennmichael123

bun.lock

@@ -57,8 +57,8 @@
     "zip:windows-x64": "zip -j bin/bumpx-windows-x64.zip bin/bumpx-windows-x64.exe",
     "zip:darwin-x64": "zip -j bin/bumpx-darwin-x64.zip bin/bumpx-darwin-x64",
     "zip:darwin-arm64": "zip -j bin/bumpx-darwin-arm64.zip bin/bumpx-darwin-arm64",
-    "lint": "bunx --bun eslint .",
-    "lint:fix": "bunx --bun eslint . --fix",
+    "lint": "bunx --bun pickier .",
+    "lint:fix": "bunx --bun pickier . --fix",
     "typecheck": "bunx tsc --noEmit",
     "prepublishOnly": "bun --bun run build && bun run compile:all && bun run zip",
     "test": "bun test"