Everything not part of the agent<->frontend contract is now unexported:
- contextConfig/Builder/Stats, loopConfig, toolExecutor, confirmFn,
run, state, toolResult — internal loop/session machinery
- buildFirstPrompt, systemPrompt, builtinTools — impl details
- agentCore struct (NewAgentCore returns Core)
- Session methods (saveTo, history, rollback, compact, etc.)
- AgentEnv internal fields (mcpExec, exec, confirm, tools, etc.)
App-level utilities moved from pkg/agent to cmd/ollie:
- resolveBackendName, defaultModelForBackend, newSessionID,
agentConfigPath
RestoreSession now takes int (ctxOverhead) directly, eliminating
the need for contextConfig to be public.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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