Route MCP tool calls to mixer agent apis

[keyurva]

• Added USE_MIXER_AGENT_APIS env var to enable direct routing to Mixer-side agent endpoints.
• Created MixerClient to perform async POST requests with timing logging.
• Implemented mixer_service functions to communicate directly with agent/get_observations and agent/search_indicators endpoints.
• Created mixer_tools to expose tool signatures without legacy parameters like maybe_bilateral.
• Modified application startup to conditionally skip initializing the Python client when Mixer mode is active.

Testing on staging

• Triggered staging deployment, then manually edited variables to connect to Mixer on autopush and setting USE_MIXER_AGENT_APIS=true
• Tested from both MCP inspector and Gemini CLI and inspected logs to verify the expected calls were made to the agent apis

[gemini-code-assist]

Code Review

This pull request introduces support for Mixer-side agent endpoints as an alternative to local processing, controlled by the USE_MIXER_AGENT_APIS configuration flag. It adds a new MixerClient for async communication, service and tool layers for fetching observations and searching indicators, and corresponding integration tests. Feedback on these changes suggests improving the LLM instructions in search_indicators.md by replacing the fictional parent place 'Middle Earth' with a real-world entity, and enhancing the robustness of MixerClient.post by handling network and JSON parsing errors while preventing potential sensitive data exposure in logs.

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[clincoln8]

Let's go!

Consider removing the prefix "mixer" everywhere and replace with something like "api" or "agent_api"

[keyurva]

Let's go!

Consider removing the prefix "mixer" everywhere and replace with something like "api" or "agent_api"

Thanks! Renamed to "agent_api".