Add deprecated forge-gitea and forge-github skill entries to the main
README, and create a new misc category for rarely used skills like
tmux-launch-agent.
- New common/misc/tmux-launch-agent skill with detect-agent script
and agents-seed.md (moved from engineering/setup-skills)
- implement-issue simplified: delegates agent dispatch to
tmux-launch-agent instead of inlining it
- setup-skills stripped of Section E (agent CLI config)
- New in-progress/agent-handoff skill using tmux-launch-agent
- PKM skills simplified: conversation-summary and pkm-curation
rewritten with leaner process, crit streamlined
- knowledge-gardener removed (moved to common/in-progress/)
- All READMEs updated to match
gitadmin