INFRA-69: README documented the deleted claude-code-review.yaml workflow and
its rollout as the live PR-review setup. PR reviews are handled by the official
Claude Code App (since 2026-05-13); corrected the workflow list, added a PR
Reviews note, marked the legacy rollout script, and replaced the obsolete
rollout step. Preserved the claude-code-ci App + secrets (compliance-audit
still uses them).
INFRA-68: add SECURITY.md (private vuln reporting via GitHub advisory / email)
and SUPPORT.md (Jira INFRA, handbook, security pointer).
