fix(harness): upgrade Agent SDK 0.1→0.2, add FakeHarness#50
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- Upgrade @anthropic-ai/claude-agent-sdk from 0.1.55 to 0.2.87 (fixes chat hang caused by SDK/CLI protocol mismatch) - Add stderr capture to SDK subprocess so errors are visible in debug mode instead of silently discarded - Add FakeHarness — deterministic test double that yields scripted AgentEvent sequences without subprocess/API calls (15 tests) - Fix tool() handler signature for new SDK's CallToolResult type
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Summary
@anthropic-ai/claude-agent-sdkfrom 0.1.55 to 0.2.87 — fixes chat hang caused by SDK/CLI protocol mismatch with newer Claude Code native binarystderrcapture to SDK subprocess so nono/claude errors are visible in debug mode (AUTONAV_DEBUG=1) instead of silently discardedFakeHarness— deterministic test double implementing theHarnessinterface with scriptedAgentEventsequences, enabling E2E testing without subprocess spawning or API callstool()handler signature for new SDK'sCallToolResulttypeTest plan