fix: align deploy flow with post-receive checkout (no .git in /var/www)

2026-05-30T07:26:08Z

The working tree at /var/www/prism-v2 is populated by a post-receive hook that does `git --work-tree=... checkout -f`, so it has no .git directory. Drop git operations from deploy.sh and add scripts/post-receive.sample plus README setup for the bare repo + hook + sudoers wiring. Co-Authored-By: Claude Opus 4.7

prism-v2.git/scripts/post-receive.sample, branch master

fix: align deploy flow with post-receive checkout (no .git in /var/www)