feat: add Ollama agent with LlamaIndex and dynamic tool loading

[abhijeet-dhumal]

Adds a local AI agent that drives the MCP server using Ollama-hosted models, with token-efficient tool discovery to avoid context overflow.

Fixes : #15

[google-oss-prow]

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[abhijeet-dhumal]

Deferring to Phase 3 (Multi-Provider Agent Architecture) per ROADMAP.md. The design in #15 should land before this large agent runtime PR.
/close

[google-oss-prow]

@abhijeet-dhumal: Closed this PR.

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In response to this:

Deferring to Phase 3 (Multi-Provider Agent Architecture) per ROADMAP.md. The design in #15 should land before this large agent runtime PR. Feel free to reopen once Phase 3 kicks off — the work here won't be lost.

/close

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