refactor: migrate core/agent to Core primitives — reference implementation
Phase 1: go-io/go-log → core.Fs{}, core.E(), core.Error/Info/Warn
Phase 2: strings/fmt → core.Contains, core.Sprintf, core.Split etc
Phase 3: embed.FS → core.Mount/core.Embed, core.Extract
Phase 4: cmd/main.go → core.Command(), c.Cli().Run(), no cli package
All packages migrated:
- pkg/lib (Codex): core.Mount, core.Extract, Result returns, AX comments
- pkg/setup (Codex): core.Fs, core.E, fixed missing lib helpers
- pkg/brain (Codex): Core primitives, AX comments
- pkg/monitor (Codex): Core string/logging primitives
- pkg/agentic (Codex): 20 files, Core primitives throughout
- cmd/main.go: pure Core CLI, no fmt/log/filepath/strings/cli
Remaining stdlib: path/filepath (Core doesn't wrap OS paths),
fmt.Sscanf/strings.Map (no Core equivalent).
Co-Authored-By: Virgil <virgil@lethean.io>
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