fix: feat: Support pluggable agent runtimes (Claude SDK, Strands, Hermes, and others) (#1848) - #2609
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…ble runtimes (caipe-io#1848) Defines the AgentRuntime Protocol (runtime_base.py) and supporting value objects (Message, RuntimeConfig, ToolDefinition, AgentState, StreamEvent) that all runtimes must conform to. Adds 10 unit tests pinning the contract and a design spec at docs/docs/specs/2026-08-26-1848-pluggable-runtimes/. This is the foundation slice only — no changes to the existing deepagents/LangGraph AgentRuntime. Follow-up PRs will: * wrap the existing class as LangGraphAgentRuntime (Phase 2) * add Claude SDK / Strands / Hermes adapters (Phase 4) * surface the runtime choice in the agent editor UI (Phase 4) * normalize streaming events to A2A at the SSE boundary (Phase 4) * ensure conversation portability across runtimes (Phase 5) Refs: caipe-io#1848 Signed-off-by: Syed Annas <annas.mazhar10@gmail.com>
…pytest-asyncio The previous commit advertised '10/10 tests pass in sandbox' but the async tests used @pytest.mark.asyncio which requires the pytest-asyncio plugin — not installed in the default test environment, so 5/10 actually failed. This converts the 5 async test bodies to plain def functions wrapping asyncio.run() so they execute with the stdlib test runner only. No new dependencies, no project config changes. Verified: PYTHONPATH=.../src python3 -m pytest .../tests/test_runtime_base.py -> 10 passed in 0.06s Refs caipe-io#1848 Signed-off-by: Syed Annas <annas.mazhar10@gmail.com>
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