Resolves conflicts after the agent loop refactor on main:
- pkg/agent/loop.go was deleted upstream (logic split into agent.go,
agent_init.go, pipeline.go, etc.); accepted the deletion.
- Moved the delegate tool registration block from the old loop.go
into registerSharedTools in pkg/agent/agent_init.go, immediately
after the spawn/spawn_status block. Logic and gating
(len(registry.ListAgentIDs()) > 1) are unchanged.
- pkg/agent/subturn.go and pkg/agent/subturn_test.go merged cleanly
on their own; TargetAgentID field, validation, registry lookup,
and tests all preserved.
Verified locally:
- go build ./pkg/agent/... ./pkg/tools/... clean
- go vet clean
- TestDelegateTool* (17 cases) pass
- TestSpawnSubTurn_TargetAgentID_* (3 cases) pass
- TestDelegateToolRegistered_MultiAgent / _SingleAgent pass
- full pkg/agent + pkg/tools test suites green
- centralize web search provider readiness and resolution logic
- fall back when the configured provider is unavailable or invalid
- allow native-search-capable models to use built-in search without the client tool
- simplify the tools page and add direct access to web search settings
- add backend, agent, and integration tests for the new selection behavior
