feat: config with agents rework

.sisyphus/evidence/task-3-schema-sample-parsed.json

@@ -0,0 +1 @@
+{"context":["../../context/profile.md"],"description":"Personal AI assistant (Plan Mode). Read-only analysis, planning, and guidance","display_name":"Chiron (Assistant)","max_turns":50,"mode":"primary","name":"chiron","permissions":{"bash":{"intent":"ask","rules":["git status*:allow","git log*:allow","git diff*:allow","git branch*:allow","git show*:allow","grep *:allow","ls *:allow","cat *:allow","head *:allow","tail *:allow","wc *:allow","which *:allow","echo *:allow","nix *:allow"]},"edit":{"intent":"deny"},"external_directory":{"intent":"ask","rules":["~/p/**:allow","~/.config/opencode/**:allow","/tmp/**:allow","/run/agenix/**:allow"]},"question":{"intent":"allow"},"webfetch":{"intent":"allow"},"websearch":{"intent":"allow"}},"rules":["languages/nix","languages/python","concerns/testing"],"skills":["systematic-debugging","git-master","brainstorming"],"tags":["assistant","plan-mode","read-only"]}