fix(deps): pin pydantic-ai to the 2.x major (<3.0)

[michaelassraf]

pydantic-ai was unbounded (>=1.0.6), so pip install pulled whatever latest happened to be — which is exactly how the OpenAIModel → OpenAIChatModel rename broke python -m codewiki with no code change on our side.

Pin it to the current major (>=2.0,<3.0) in pyproject.toml (used by the doc-orchestrator's pip install /tmp/CodeWiki) and requirements.txt. A future pydantic-ai 3.x could rename again and break even the try/except fallback (which expects the pre-2.x name), so majors should be adopted deliberately, not silently.

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Reviewing files that changed from the base of the PR and between 3ece14a and cf55c28.

📒 Files selected for processing (2)

• pyproject.toml
• requirements.txt

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