feat: nightly hardening - responses api content parsing

[mouse-value-add]

Problem

The generic HTTP provider does not parse OpenAI Responses API payloads ( and ). This causes valid model responses to be treated as empty content, reducing reliability across compatible endpoints.

Approach

• Extended to support:
  • top-level
  • nested aggregation
• Added targeted tests covering both Responses API shapes.

Verification

• Ran: ============================= test session starts ==============================
  platform darwin -- Python 3.9.6, pytest-8.4.2, pluggy-1.6.0
  rootdir: /private/tmp/oss-loop/PromptLens
  configfile: pyproject.toml
  plugins: anyio-4.12.1, asyncio-1.2.0, cov-7.1.0
  asyncio: mode=strict, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
  collected 11 items

tests/test_http_provider_response_parsing.py ...... [ 54%]
tests/test_cli_hardening.py ... [ 81%]
tests/test_loader_top_level_validation.py .. [100%]

=============================== warnings summary ===============================
promptlens/models/tools.py:14
/private/tmp/oss-loop/PromptLens/promptlens/models/tools.py:14: PydanticDeprecatedSince20: Support for class-based config is deprecated, use ConfigDict instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.12/migration/
class ToolParameter(BaseModel):

promptlens/models/test_case.py:10
/private/tmp/oss-loop/PromptLens/promptlens/models/test_case.py:10: PydanticDeprecatedSince20: Support for class-based config is deprecated, use ConfigDict instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.12/migration/
class TestCase(BaseModel):

promptlens/models/test_case.py:66
/private/tmp/oss-loop/PromptLens/promptlens/models/test_case.py:66: PydanticDeprecatedSince20: Support for class-based config is deprecated, use ConfigDict instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.12/migration/
class GoldenSet(BaseModel):

promptlens/models/config.py:100
/private/tmp/oss-loop/PromptLens/promptlens/models/config.py:100: PydanticDeprecatedSince20: Support for class-based config is deprecated, use ConfigDict instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.12/migration/
class RunConfig(BaseModel):

../../../../Users/mouse/Library/Python/3.9/lib/python/site-packages/google/api_core/_python_version_support.py:242
/Users/mouse/Library/Python/3.9/lib/python/site-packages/google/api_core/_python_version_support.py:242: FutureWarning: You are using a non-supported Python version (3.9.6). Google will not post any further updates to google.api_core supporting this Python version. Please upgrade to the latest Python version, or at least Python 3.10, and then update google.api_core.
warnings.warn(message, FutureWarning)

../../../../Users/mouse/Library/Python/3.9/lib/python/site-packages/urllib3/init.py:35
/Users/mouse/Library/Python/3.9/lib/python/site-packages/urllib3/init.py:35: NotOpenSSLWarning: urllib3 v2 only supports OpenSSL 1.1.1+, currently the 'ssl' module is compiled with 'LibreSSL 2.8.3'. See: urllib3/urllib3#3020
warnings.warn(

../../../../Users/mouse/Library/Python/3.9/lib/python/site-packages/google/auth/init.py:54
/Users/mouse/Library/Python/3.9/lib/python/site-packages/google/auth/init.py:54: FutureWarning: You are using a Python version 3.9 past its end of life. Google will update google-auth with critical bug fixes on a best-effort basis, but not with any other fixes or features. Please upgrade your Python version, and then update google-auth.
warnings.warn(eol_message.format("3.9"), FutureWarning)

../../../../Users/mouse/Library/Python/3.9/lib/python/site-packages/google/oauth2/init.py:40
/Users/mouse/Library/Python/3.9/lib/python/site-packages/google/oauth2/init.py:40: FutureWarning: You are using a Python version 3.9 past its end of life. Google will update google-auth with critical bug fixes on a best-effort basis, but not with any other fixes or features. Please upgrade your Python version, and then update google-auth.
warnings.warn(eol_message.format("3.9"), FutureWarning)

promptlens/providers/google.py:8
/private/tmp/oss-loop/PromptLens/promptlens/providers/google.py:8: FutureWarning:

All support for the google.generativeai package has ended. It will no longer be receiving
updates or bug fixes. Please switch to the google.genai package as soon as possible.
See README for more details:

https://github.com/google-gemini/deprecated-generative-ai-python/blob/main/README.md

import google.generativeai as genai

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================ tests coverage ================================
_______________ coverage: platform darwin, python 3.9.6-final-0 ________________

Name Stmts Miss Cover

promptlens/init.py 3 0 100%
promptlens/main.py 3 3 0%
promptlens/cli.py 169 120 29%
promptlens/exporters/init.py 6 0 100%
promptlens/exporters/base.py 15 5 67%
promptlens/exporters/csv_exporter.py 26 14 46%
promptlens/exporters/html_exporter.py 38 25 34%
promptlens/exporters/json_exporter.py 16 6 62%
promptlens/exporters/markdown_exporter.py 77 66 14%
promptlens/judges/init.py 3 0 100%
promptlens/judges/base.py 15 3 80%
promptlens/judges/llm_judge.py 71 50 30%
promptlens/judges/parser.py 107 97 9%
promptlens/judges/prompts.py 30 25 17%
promptlens/loaders/init.py 4 0 100%
promptlens/loaders/base.py 14 3 79%
promptlens/loaders/json_loader.py 23 8 65%
promptlens/loaders/yaml_loader.py 34 17 50%
promptlens/models/init.py 4 0 100%
promptlens/models/config.py 41 0 100%
promptlens/models/result.py 60 13 78%
promptlens/models/test_case.py 25 0 100%
promptlens/models/tools.py 74 34 54%
promptlens/providers/init.py 3 0 100%
promptlens/providers/anthropic.py 52 32 38%
promptlens/providers/base.py 23 6 74%
promptlens/providers/factory.py 21 10 52%
promptlens/providers/google.py 47 28 40%
promptlens/providers/http.py 86 29 66%
promptlens/providers/openai.py 57 36 37%
promptlens/providers/you.py 57 39 32%
promptlens/runners/init.py 2 0 100%
promptlens/runners/runner.py 96 74 23%
promptlens/utils/init.py 1 0 100%
promptlens/utils/cost.py 15 11 27%
promptlens/utils/diff.py 25 25 0%
promptlens/utils/retry.py 21 15 29%
promptlens/utils/timing.py 24 13 46%

TOTAL 1388 807 42%
Coverage HTML written to dir htmlcov
======================== 11 passed, 9 warnings in 0.80s ========================

• Result: 11 passed.

Risks

• Low risk: change is additive and only broadens accepted response schemas.
• Minor risk of unintended text concatenation if non-standard payloads include unexpected fields in content items.

Rollback plan

• Revert commit from this PR branch.
• Re-run the same test suite to confirm baseline behavior is restored.