feat(runtime): promote unary endpoint helpers

[furionw]

Based on #13293.

Why

Unary endpoint adapters are generic runtime building blocks, not component-only experiments. Keeping their implementations in the components wheel prevents runtime-only consumers from using them and makes examples depend on an internal namespace. Give each helper a stable home matching its responsibility without changing request, streaming, cancellation, or cleanup behavior.

Effect

Before:

from dynamo.experimental.endpoint import UnaryClient, serve_unary_endpoint
from dynamo.experimental.llm import LLMUnaryClient, with_engine_data

After:

from dynamo.runtime import UnaryClient, serve_unary_endpoint
from dynamo.llm import LLMUnaryClient, with_engine_data

What Change

• Export generic unary endpoint helpers from dynamo.runtime.
• Export Generate aggregation helpers from dynamo.llm.
• Move implementation and coverage; retain only the empty experimental package marker.

Test Plan

• Passed 27 unary behavior tests.
• Passed pre-commit, compileall, and strict CODEOWNERS coverage.

Full PR sequence

1. #13293 — encoder handoff (merged)
2. #15195 — unary endpoint helpers (merged)
3. #15552 — model and client utilities
4. #14859 — application-owned orchestrator example
5. #15200 — draft end-to-end verification

The three open PRs form GitHub stack #15572. The first two remain in completed stack #15197.

Summary by CodeRabbit

• New Features

  • Unary client and endpoint-serving utilities are now available directly from the dynamo.runtime package.
  • LLM unary client and engine-data utilities are now available directly from the dynamo.llm package, making these capabilities easier to access through the main package interfaces.

• Tests

  • Binding tests now verify that the runtime and LLM utilities are accessible through their package interfaces.

[github-actions]

🌿 Fern Docs Preview: https://nvidia-preview-01a0cb90-8914-764a-9d34-caa3d91a1150.docs.buildwithfern.com/dynamo/dev

[coderabbitai]

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Walkthrough

The dynamo.llm and dynamo.runtime packages now expose unary APIs. Binding and unary tests use these package-level imports, and integration test endpoint names use the unary- prefix.

Changes

Python unary exports

Layer / File(s)	Summary
Package-level unary exports lib/bindings/python/src/dynamo/llm/__init__.py, lib/bindings/python/src/dynamo/runtime/__init__.py	dynamo.llm re-exports LLMUnaryClient and with_engine_data. dynamo.runtime re-exports UnaryClient and serve_unary_endpoint.
Tests for package-level imports lib/bindings/python/tests/test_bindings_install.py, lib/bindings/python/tests/test_llm_unary.py, lib/bindings/python/tests/test_unary.py, lib/bindings/python/tests/test_unary_integration.py	The tests import the unary APIs from dynamo.llm and dynamo.runtime. The install test checks all four attributes. Integration test endpoint names use the unary- prefix.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 6737b

This does not change runtime behavior, but the bindings test violates the repository’s Python import guidance. Move the import to module scope before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: promoting unary endpoint helpers to the runtime API.
Description check	✅ Passed	The description explains the rationale, API changes, and test plan. It does not include the required Related Issues section or identify where the reviewer should start. “Based on #13293” provides issu…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

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[coderabbitai]

Actionable comments posted: 1

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🤖 Prompt to fix review comments

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Inline comments:
In `@lib/bindings/python/tests/test_bindings_install.py`:
- Line 28: Move the dynamo.llm import from inside test_bindings_install to
module scope so importability is checked during test collection; keep the
existing assertions and other imports unchanged.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: ai-dynamo/dynamo/.coderabbit.yaml

Review profile: CHILL

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Run ID: 9ba68cd4-f813-4d8a-b1f5-77e7f968a557

📥 Commits

Reviewing files that changed from the base of the PR and between 94a676d and 6737b75.

📒 Files selected for processing (8)

• lib/bindings/python/src/dynamo/llm/__init__.py
• lib/bindings/python/src/dynamo/llm/_unary.py
• lib/bindings/python/src/dynamo/runtime/__init__.py
• lib/bindings/python/src/dynamo/runtime/_unary.py
• lib/bindings/python/tests/test_bindings_install.py
• lib/bindings/python/tests/test_llm_unary.py
• lib/bindings/python/tests/test_unary.py
• lib/bindings/python/tests/test_unary_integration.py

Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review.

[dynamo-review-agent]

Previously reported defects still present:

• Original discussion: The prior comment is still present: test_bindings_install imports dynamo.llm inside the test body even though there is no optional-dependency guard or collection skip, so module importability is not checked until execution.

[GuanLuo]

Why there is no change in the actual API caller? This change is fresh import, and I don't see who is using it

[furionw]

@GuanLuo Re: your review question: the concrete caller is in #14859, examples/custom_encoder/remote/orchestrator_worker.py, which imports LLMUnaryClient and serve_unary_endpoint from the promoted packages. I kept this PR focused on moving and stabilizing the helpers plus their coverage so that example can consume a public runtime API instead of an experimental component namespace; the caller remains separate to keep this package-layer change reviewable.