Remove global git-lfs hooks from dotfiles

The four hooks (post-checkout, post-commit, post-merge, pre-push)
were generic git-lfs boilerplate that called 'git lfs <action>' for
each event. Under the global core.hooksPath, they required git-lfs
on PATH at every git invocation — which broke under launchd's
stripped PATH (discovered 2026-04-16 while fixing gitvault).

A repo that actually uses LFS can install its local hooks via
'git lfs install' within the repo (.git/hooks/*). The global
hookspath shouldn't require LFS to be present.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

git/hooks/post-checkout

@@ -1,3 +0,0 @@
-#!/bin/sh
-command -v git-lfs >/dev/null 2>&1 || { printf >&2 "\n%s\n\n" "This repository is configured for Git LFS but 'git-lfs' was not found on your path. If you no longer wish to use Git LFS, remove this hook by deleting the 'post-checkout' file in the hooks directory (set by 'core.hookspath'; usually '.git/hooks')."; exit 2; }
-git lfs post-checkout "$@"

git/hooks/post-commit

@@ -1,3 +0,0 @@
-#!/bin/sh
-command -v git-lfs >/dev/null 2>&1 || { printf >&2 "\n%s\n\n" "This repository is configured for Git LFS but 'git-lfs' was not found on your path. If you no longer wish to use Git LFS, remove this hook by deleting the 'post-commit' file in the hooks directory (set by 'core.hookspath'; usually '.git/hooks')."; exit 2; }
-git lfs post-commit "$@"

git/hooks/post-merge

@@ -1,3 +0,0 @@
-#!/bin/sh
-command -v git-lfs >/dev/null 2>&1 || { printf >&2 "\n%s\n\n" "This repository is configured for Git LFS but 'git-lfs' was not found on your path. If you no longer wish to use Git LFS, remove this hook by deleting the 'post-merge' file in the hooks directory (set by 'core.hookspath'; usually '.git/hooks')."; exit 2; }
-git lfs post-merge "$@"

git/hooks/pre-push

@@ -1,3 +0,0 @@
-#!/bin/sh
-command -v git-lfs >/dev/null 2>&1 || { printf >&2 "\n%s\n\n" "This repository is configured for Git LFS but 'git-lfs' was not found on your path. If you no longer wish to use Git LFS, remove this hook by deleting the 'pre-push' file in the hooks directory (set by 'core.hookspath'; usually '.git/hooks')."; exit 2; }
-git lfs pre-push "$@"