feat: add nestjs development patterns

fix: respect home overrides in hook utilities

fix: restore markdownlint baseline on main

fix: clean up observer sessions on lifecycle end

feat: add jira integration workflow

feat: add C# and Dart language support

feat: add web frontend rules and design quality hook

fix: port ci and markdown cleanup from backlog

fix: add POSIX fallback for observer lazy-start

refactor: consolidate writing voice rules

refactor: extract social graph ranking core

feat(skills): add brand voice and network ops lanes

fix: port safe ci cleanup from backlog

feat: sync the codex baseline and agent roles

fix: harden install and codex sync portability