chore(core): remove dead streaming types and LMRequestPatch from core types

[detail-app]

📝 Changes Description

This MR/PR contains the following changes:
Removes ~390 lines of dead code from dspy/core/types.py and its tests: the
never-wired-up streaming subsystem (LMDelta/LM*Delta, LMStreamEvent
variants, LMOutputBuilder, LMStream, AsyncLMStream, plus the
streaming-only helpers _finalize_stream_part and _parse_json_object_strict)
and the unused LMRequestPatch dataclass together with its sole helper
_merge_lm_config. Now-unused imports (AsyncIterator, Callable,
dataclass, dataclass_field) and the corresponding dead tests in
tests/core/test_types.py are also removed.

Context

None of these symbols were in __all__ or re-exported via dspy/__init__.py,
and none had any production call-site. The streaming types were a parallel
design that was never connected to the actual streaming feature, which lives
in dspy/streaming/ (built on litellm's ModelResponseStream + StreamListener).
LMRequestPatch and _merge_lm_config were only exercised by tests; the
remaining _parse_json_object helper is kept since it has an independent
production caller in _tool_call_from_openai. No runtime behavior, outputs,
or public API surface change.

✅ Contributor Checklist

• Pre-Commit checks are passing (locally and remotely)
• Title of your PR / MR corresponds to the required format
• Commit message follows required format {label}(dspy): {message}

⚠️ Warnings

None. ruff check passes; tests/core/test_types.py, tests/clients/test_lm.py,
tests/adapters/test_tool.py, and tests/predict/test_rlm.py all pass.

History

• Last materially changed May 2026 (Add core language model types stanfordnlp/dspy#9786 @MaximeRivest)

---

Dead Code PRs can be configured here.

[greptile-apps]

Greptile Summary

Removes an unused request-patch abstraction and an unconnected streaming type hierarchy from core types.

• Deletes LMRequestPatch, its configuration merge helper, and unused imports.
• Deletes the unused stream events, deltas, builders, wrappers, and parsing helpers.
• Removes tests that exclusively covered the deleted implementations while retaining coverage for surviving configuration behavior.

Confidence Score: 5/5

The PR appears safe to merge because the deleted symbols are unreferenced, not publicly exported, and disconnected from the active streaming implementation.

No actionable failures remain: all removed implementations were dead code, their deleted tests covered only those implementations, and surviving behavior retains relevant test coverage.

Important Files Changed

Filename	Overview
dspy/core/types.py	Removes unreferenced request-patch and streaming abstractions without affecting surviving callers or exports.
tests/core/test_types.py	Removes tests specific to deleted code while preserving coverage of the surviving extension-flattening path.

_{Reviews (1): Last reviewed commit: "chore(core): remove dead streaming types..." | Re-trigger Greptile}