feat: split skill into router and flow authoring

chore: release 3.1.1 with compact agent texts

chore: release 3.1.0

feat: read flows from the project and the user's home

feat!: replace skills with /fs commands driven by engine responses

fix: strengthen free-text input instructions

fix: use chat input outside flow decisions

feat: move archived runs into a separate folder

fix: allow archiving runs with changed snapshots

feat: add run management and automatic archival

feat!: package CLI for uv and migrate to GigaCode

fix: ask flow questions one at a time

feat: render decision question templates