Feature/add hpc ai provider

[lioZ129]

Two related pr:

• Feature/add hpc ai provider haystack#11264
• Feature/add hpc ai provider haystack-integrations#472

Proposed Changes:

• Add a new hpc-ai-haystack integration under integrations/hpc_ai
• Introduce HPCAIChatGenerator, built on top of Haystack's OpenAIChatGenerator, to support HPC-AI's OpenAI-compatible API
• Default the integration to:
  • HPC_AI_API_KEY for authentication
  • HPC_AI_BASE_URL as an optional override
  • https://api.hpc-ai.com/inference/v1 as the default base URL
• Register the officially supported models via SUPPORTED_MODELS:
  • minimax/minimax-m2.5
  • moonshotai/kimi-k2.5
• Add integration-specific tests, examples, README, and pydoc config
• Wire the new integration into the repo-level inventory and CI configuration:
  • root README.md
  • .github/workflows/hpc_ai.yml
  • .github/labeler.yml
  • .github/workflows/CI_coverage_comment.yml

How did you test it?

• Ran hatch run fmt-check
• Ran hatch run test:types
• Ran hatch run test:unit
• Ran hatch run test:integration
• Performed additional local sanity checks on serialization, async tests, examples, and generated package structure

Notes for the reviewer

• This integration intentionally reuses the existing OpenAI-compatible chat generator flow rather than introducing a new transport layer
• The scope of this PR is limited to the core integration package and repo wiring
• Companion documentation changes are prepared separately in the haystack and haystack-integrations repositories

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

[Copilot]

Pull request overview

• Adds a new hpc-ai-haystack integration package under integrations/hpc_ai, implementing HPCAIChatGenerator as an OpenAIChatGenerator subclass for HPC-AI’s OpenAI-compatible chat completions API.
• Wires the integration into repo discovery and automation (inventory row in root README.md, labeler rules, dedicated CI workflow, and coverage-comment workflow allowlist).

Changes:

• Introduce HPCAIChatGenerator with HPC-AI defaults (HPC_AI_API_KEY, optional HPC_AI_BASE_URL, default base URL) and a small supported-model registry.
• Add examples + unit/integration tests (sync + async), including tool-calling and streaming coverage.
• Add CI workflow + repo-level wiring for labels and coverage comments.

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
README.md	Adds the hpc-ai-haystack integration row to the repo inventory table.
integrations/hpc_ai/src/haystack_integrations/components/generators/hpc_ai/chat/chat_generator.py	Implements HPCAIChatGenerator on top of OpenAIChatGenerator, overriding request preparation for HPC-AI compatibility.
integrations/hpc_ai/src/haystack_integrations/components/generators/hpc_ai/__init__.py	Exports HPCAIChatGenerator from the integration package.
integrations/hpc_ai/src/haystack_integrations/components/generators/hpc_ai/chat/__init__.py	Declares the chat subpackage.
integrations/hpc_ai/src/haystack_integrations/components/generators/py.typed	Marks the package as typed for type checkers.
integrations/hpc_ai/tests/test_hpc_ai_chat_generator.py	Adds sync tests covering init/serde, tools, streaming chunk handling, and pipeline usage.
integrations/hpc_ai/tests/test_hpc_ai_chat_generator_async.py	Adds async tests covering init and async run paths (incl. streaming + tools).
integrations/hpc_ai/tests/__init__.py	Adds SPDX headers for the tests package.
integrations/hpc_ai/examples/hpc_ai_basic_example.py	Adds a minimal usage example.
integrations/hpc_ai/examples/hpc_ai_with_tools_example.py	Adds an example demonstrating tool calling + tool execution flow.
integrations/hpc_ai/README.md	Documents the integration, links, and required environment variables.
integrations/hpc_ai/pyproject.toml	Defines packaging, test/lint/type-check configuration, and dependencies for the new integration.
integrations/hpc_ai/pydoc/config_docusaurus.yml	Adds pydoc configuration for generating the integration docs page.
integrations/hpc_ai/CHANGELOG.md	Adds an initial (git-cliff managed) changelog scaffold.
integrations/hpc_ai/LICENSE.txt	Adds Apache-2.0 license text for the package.
.github/workflows/hpc_ai.yml	Adds dedicated CI workflow for linting, tests, and coverage reporting for hpc_ai.
.github/workflows/CI_coverage_comment.yml	Adds Test / hpc_ai to the workflow-run allowlist for coverage comment posting.
.github/labeler.yml	Adds integration:hpc-ai label rules for changes under integrations/hpc_ai/**.

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[lioZ129]

@julian-risch could u please review this?

[julian-risch]

@lioZ129 Thank you for your suggestion and opening this issue. Thank you also for your patience while we discussed internally if we can maintain this integration. We recommend to publish and release this integration yourself using our repository template: https://github.com/deepset-ai/custom-component
Once you have done that, you can update your PR in haystack-integrations to get your integration listed in our overview of all Haystack integrations deepset-ai/haystack-integrations#472