chore(sync): cascade fleet template@2877fb9

Auto-applied by socket-wheelhouse sync-scaffolding into cascade-socket-registry-11664.
16 file(s) touched:
  - .claude/hooks/_shared/acorn/acorn-bindgen.cjs
  - .claude/hooks/commit-author-guard/index.mts
  - .claude/hooks/no-external-issue-ref-guard/test/index.test.mts
  - .claude/hooks/no-orphaned-staging/test/index.test.mts
  - .claude/hooks/overeager-staging-guard/index.mts
  - .claude/hooks/pr-vs-push-default-reminder/index.mts
  - .claude/hooks/release-workflow-guard/test/release-workflow-guard.test.mts
  - .claude/hooks/setup-security-tools/lib/installers.mts
  - .claude/hooks/setup-security-tools/lib/token-storage.mts
  - .claude/hooks/verify-rendered-output-before-commit-reminder/test/index.test.mts
  - .claude/hooks/version-bump-order-guard/index.mts
  - .claude/skills/cascading-fleet/lib/cascade-template.sh
  - .claude/skills/cascading-fleet/lib/fleet-repos.txt
  - .claude/skills/updating-security/SKILL.md
  - .claude/skills/updating-security/reference.md
  - .claude/skills/updating/SKILL.md

Author: jdalton