midstream 0.2.0

Real-time LLM streaming with inflight analysis
Documentation 
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## Summary

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## Linked ADR / issue

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## Checklist

- [ ] Every commit is signed off (`git commit -s`) per the DCO.
- [ ] Commit messages follow Conventional Commits (`feat:` / `fix:` /
      `chore:` / …) and use `!` for breaking changes.
- [ ] CI is green locally (`cargo check --workspace`, relevant tests).
- [ ] Public API changes are documented and, if applicable, have a
      semver bump per ADR-0024.
- [ ] If this PR touches performance-sensitive paths, benches were
      run and the numbers are in the PR description (ADR-0009).
- [ ] If this PR touches the licence story, dependencies, or any
      published-crate metadata, `cargo deny check` was re-run locally
      (ADR-0014).
- [ ] Working tree only contains changes for this PR (no unrelated
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## Test plan

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## Out of scope / follow-ups

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