Sannya Singal b53271584d feat: add HyDE query transform (#10527)
## Summary

This PR adds HyDE retrieval strategy. A new hook, which changes what is
searched for, so it needs somewhere earlier to sit:
Knowledge(vector_db=..., query_transformer=HyDE(),
reranker=CohereReranker())
`QueryTransform` mirrors `Reranker` - one method, sync and async, the
async default running the sync one off the event loop. The transform
changes the query the store receives; the reranker still scores against
the question the caller asked, so relevance is judged on what the user
wanted rather than on a stand in for it.
`HyDE()` uses its own `model` if set, then the model of the agent or
team that triggered the search, then the same OpenAI default the rest of
the framework falls back to.
`get_model_kwarg` offers it only to a callee that declares `model`.
Unlike the owner kwarg, where a dropped `user_id` leaks data across
users and `**kwargs` is worth the risk, this is an enhancement: a legacy
`retrieve(query, **kwargs)` forwarding to a narrower search would raise
on an argument it never asked for, and losing the transform is the
lesser cost.

## Type of change

- [ ] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Improvement
- [ ] Model update
- [ ] Other:

---

## Checklist

- [ ] Code complies with style guidelines
- [ ] Ran format/validation scripts (`./scripts/format.sh` and
`./scripts/validate.sh`)
- [ ] Self-review completed
- [ ] Documentation updated (comments, docstrings)
- [ ] Examples and guides: Relevant cookbook examples have been included
or updated (if applicable)
- [ ] Tested in clean environment
- [ ] Tests added/updated (if applicable)

### Duplicate and AI-Generated PR Check

- [ ] I have searched existing [open pull
requests](https://github.com/agno-agi/agno/pulls) and confirmed that no
other PR already addresses this issue
- [ ] If a similar PR exists, I have explained below why this PR is a
better approach
- [ ] Check if this PR was entirely AI-generated (by Copilot, Claude
Code, Cursor, etc.)

---

## Additional Notes

Add any important context (deployment instructions, screenshots,
security considerations, etc.)

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Build, run, and manage agent platforms.

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