feat: add BrowserAgent driving contract with agent sessions#147
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Define the Browser Agent driving boundary in core-extension as a single agent that owns many sessions (wrapping the AI SDK v7 HarnessAgent): - BrowserAgentInputPort: session lifecycle (createSession/endSession), drive (sendMessage/cancel), reads (getSession/listSessions/getHistory), and a subscribe() progress stream. - New types: AgentSession/AgentSessionStatus/AgentCreateSessionParams, AgentSendMessageParams, and the AgentProgressEvent transcript union (session lifecycle + user/assistant messages + tool activity). - Update architecture diagrams: add AgentSessionRegistry Core node and note the HarnessAgent wrapping; nodes stay 'planned' (dashed). No container binding yet — implementation, the driving package, the LLM/harness adapter, and apps/agent-ui remain a later pass. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Define the Browser Agent driving boundary in core-extension as a single agent that owns many sessions (wrapping the AI SDK v7 HarnessAgent):
No container binding yet — implementation, the driving package, the LLM/harness adapter, and apps/agent-ui remain a later pass.