web: update /skills meta

docs: fix dev lifecycle meta

docs: fix meta

Add dev-lifecycle skill guide

chore: update skill index [automated]

docs: clarify install-based agent setup

docs: expand agent management guide

docs: refresh memory command reference

docs: sync supported agents guide with current CLI

docs: clarify memory database path config

docs: refresh skills command documentation

0.21.1

chore(release): publish

fix(cli): allow interactive skill add without name

0.21.0