Add OpenRouter as default LLM provider; make deprecated Gemini SDK optional#31
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- New OpenRouterProvider (stdlib urllib, OpenAI-compatible chat completions via openrouter.ai) with retry/backoff, usage-based cost tracking, and OpenRouterAPIError, mirroring existing providers. - Factory: openrouter first in auto-detect priority (OPENROUTER_API_KEY); config.py accepts and env-maps the new provider. - erdos_config.json default: openrouter + google/gemini-2.5-flash (was invalid chatgpt/gpt-5.4 combination). - google-generativeai demoted from core dependency to optional [gemini] extra; imports guarded so src.llm imports cleanly without it and Gemini tests skip instead of failing. - 19 new tests (tests/test_openrouter.py); suite green both with the SDK (333 passed, 9 skipped) and without (320 passed, 22 skipped). https://claude.ai/code/session_01KAKnLjpFZ9oF74GNW9QNtN
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What
Adds OpenRouter as the recommended/default provider (per owner direction: "just use openrouter") and untangles the deprecated Gemini SDK.
OpenRouterProvider(stdlib urllib, OpenAI-compatible chat completions) with transient-error retry/backoff, usage-based cost tracking, andOpenRouterAPIError, mirroring the existing provider patterns.OPENROUTER_API_KEYfirst;src/config.pyaccepts and env-maps the provider everywhere.erdos_config.jsondefault fixed: was an invalidchatgpt/gpt-5.4combination, nowopenrouter/google/gemini-2.5-flash.google-generativeai(officially deprecated by Google) demoted from core dependency to the optional[gemini]extra; imports guarded sosrc.llmimports cleanly without it and Gemini tests skip rather than fail.tests/test_openrouter.py.Verification
ERDOS_MOCK_MODE=1 python -m src.solver --manifest manifest.jsonstill degrades gracefully.OPENROUTER_API_KEY→OpenRouterProvider(model=google/gemini-2.5-flash).Part of the project-wide polish batch.
https://claude.ai/code/session_01KAKnLjpFZ9oF74GNW9QNtN
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