fix: make embedded PDP thread safe

[ironcommit]

Summary

Makes embedded PDP policy evaluation reuse a process-wide Wasmtime engine so concurrent authorization checks do not rebuild engine state.
The PR diff is now limited to the embedded PDP implementation and auth tests.

Changes

• Reuse a process-wide Wasmtime engine for embedded PDP evaluation.
• Update embedded PDP unit and stress coverage.
• Update scoped access-key integration coverage for policy refresh and revocation behavior.

Type of Change

• Code change (feature, bug fix, or refactor)
• Code change with documentation updates
• Documentation only
• Contributor tooling or automation
• CI, build, or test infrastructure

Quality Gates

• Tests added or updated for changed behavior
• Existing tests cover changed behavior — justification:
• Tests not applicable — justification:
• Documentation updated for user-visible behavior
• Documentation not applicable — justification: no user-facing documentation behavior changed.

Verification

• Pull request title follows the repository's Conventional Commit format
• Every commit includes an appropriate Signed-off-by: trailer
• uv run pre-commit run -a passes, or any blocked checks are identified below
• Targeted tests pass, or tests are marked not applicable above
• No secrets, API keys, or credentials are included

Targeted validation:

• git diff --check origin/main...HEAD — passed
• git diff --name-status origin/main...HEAD — verified final PR diff is limited to embedded PDP/auth test files
• DCO audit for origin/main..HEAD — passed for 2a68dd0fd, 214473407, f60e6c114, and 0ea197098
• uv run pre-commit run -a — failed: helm-docs and copyright-fix modified unrelated tracked files, then copyright-fix reported existing non-SPDX headers in packages/garak_api/garakapi/_plugins.py, packages/garak_api/garakapi/exception.py, and packages/garak_api/garakapi/_config.py. The unrelated hook-generated edits were discarded.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between f39cf12 and 6514630.

📒 Files selected for processing (1)

• .github/workflows/ci.yaml

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📝 Walkthrough

Walkthrough

The Makefile and CI workflow configure pytest worker behavior and output capture. OPAPolicy reuses a shared Wasmtime engine. The scoped access-key integration test adds authorization polling and reorganizes validation.

Changes

Auth and test execution updates

Layer / File(s)	Summary
Configure worker restart limits Makefile, .github/workflows/ci.yaml	The Makefile defines PYTEST_MAX_WORKER_RESTART with a default of 2. CI test targets set it to 0. The integration job sets PYTEST_EXTRA to --capture=no.
Share the Wasmtime engine services/core/auth/src/nmp/core/auth/app/embedded_pdp/engine.py	A thread-safe module-level engine is initialized once. OPAPolicy reuses it with fuel consumption enabled.
Reorganize scoped access-key validation services/core/auth/tests/integration/test_scoped_access_keys.py	The test polls for authorization state, sets bundle_cache_seconds to 0.1, uses patched request helpers, and retains authentication and revocation assertions.

Possibly related PRs

• NVIDIA-NeMo/nemo-platform#1095: Modifies the same scoped access-key integration test and its lifecycle assertions.
• NVIDIA-NeMo/nemo-platform#1290: Modifies the same Makefile variable and pytest worker-restart settings for CI targets.

Suggested reviewers: anastasia-nesterenko, mckornfield

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the shared, thread-safe embedded PDP engine change, although it does not mention the integration test restart changes.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch restart/rsadler

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[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	33361/42124	79.2%	64.1%
Integration Tests	19474/39923	48.8%	21.0%

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@services/core/auth/tests/integration/test_scoped_access_keys.py`:
- Line 60: Update the integration test around the role-binding creation and
key-revocation writes to poll for the expected authorization response with a
finite timeout before proceeding, rather than relying on the 0.05-second
policy_data_refresh_interval. Apply the same propagation wait to both write
paths and preserve the existing assertions once the expected response is
observed.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 35929f85-f893-4769-b585-4776ba9eb3d0

📥 Commits

Reviewing files that changed from the base of the PR and between 8c13bdf and 627303e.

📒 Files selected for processing (2)

• services/core/auth/src/nmp/core/auth/app/embedded_pdp/engine.py
• services/core/auth/tests/integration/test_scoped_access_keys.py

[mckornfield]

yar this makefile change is what my earlier codex run got me to