Critical fixes: - C1: AgentRuntime now uses ContextBuilder to build system prompt from AgentContext - C2: resolve_agents_md fixed to walk directories correctly, discovers intermediates Important fixes: - I1: cargo fmt passes - I2: Clippy while_let_loop resolved by C2 rewrite - I3: Token budget warning test now has meaningful assertion - I4: ReadAgentsMdTool validates only AGENTS.md files Minor fixes: - M1: MockGraphStore moved to tests/common/mod.rs - M2: Planner profile restricted to graph+signal; researcher note about Phase 5 search - M3: Clippy single_char_add_str warnings fixed All tests pass: agent_runtime_test, agent_types_test, profile_test Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>