chore(profiling): native py3.15 ABI and test install subdirs

[vlad-scherbich]

prev: #19267 | next: #19270

Summary

Native profiling C++/Rust ABI for 3.15 and INSTALL_SUBDIR for native wrapper tests (formerly #19268). Enables building/stack-testing natives on 3.15; does not wire CI matrix or lift the packaging gate.

Layer	This PR
Compiled	native headers, echion layout, test install subdirs
Armed	—
Observable	natives compile/link on 3.15

Test plan

• Native profiling tests green on 3.15
• Stack merges cleanly into chore(profiling): collectors and py3.15 CI matrix #19270 base

Tracker

• Contributes to [3.15] Profiling 3.15 #17817
• Contributes to [Tracker] Python 3.15 integration parity #17809

[datadog-datadog-prod-us1-2]

 

⚠️ Warnings

🚦 2 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-py | download win_arm64 wheels

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DataDog/apm-reliability/dd-trace-py | prechecks

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ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

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[cit-pr-commenter-54b7da]

Circular import analysis

⚠️ Existing circular imports

There are 3 circular imports that already exist on the base branch and have not been changed by this PR.

ddtrace.llmobs -> ddtrace.llmobs._evaluators -> ddtrace.llmobs._evaluators.format -> ddtrace.llmobs._experiment -> ddtrace.llmobs
ddtrace.errortracking._handled_exceptions.bytecode_injector -> ddtrace.errortracking._handled_exceptions.callbacks -> ddtrace.errortracking._handled_exceptions.collector -> ddtrace.errortracking._handled_exceptions.bytecode_reporting -> ddtrace.errortracking._handled_exceptions.bytecode_injector
ddtrace.appsec._asm_request_context -> ddtrace.appsec._iast._iast_request_context_base -> ddtrace.appsec._iast._iast_env -> ddtrace.appsec._iast.reporter -> ddtrace.appsec._exploit_prevention.stack_traces -> ddtrace.appsec._asm_request_context

[cit-pr-commenter-54b7da]

Dependency direction analysis

⚠️ Existing dependency direction violations

There are 250 dependency direction violations that already exist on the base branch and have not been changed by this PR.

Show existing violations (showing 5 of 250 highest severity)

ddtrace.internal.tracemethods -×-> ddtrace.trace  (internal-core -> product:tracing, score=135)
ddtrace.internal.ci_visibility.git_client -×-> ddtrace.trace  (product:ci_visibility -> product:tracing, score=133)
ddtrace.internal.ci_visibility.filters -×-> ddtrace.trace  (product:ci_visibility -> product:tracing, score=133)
ddtrace.debugging._signal.tracing -×-> ddtrace.trace  (product:debugging -> product:tracing, score=133)
ddtrace.llmobs._integrations.llama_index -×-> ddtrace.trace  (product:llmobs -> product:tracing, score=133)

To see all violations, download the layers-base.json and layers-pr.json artifacts from this CI job and run:

uv run --script scripts/import-analysis/layers.py compare layers-base.json layers-pr.json

[cit-pr-commenter-54b7da]

Codeowners resolved as

Resolved from the full PR diff against vlad/profiling-native-test-install-subdir using the target branch CODEOWNERS file.
CODEOWNERS team requests not listed below are not required by the current file set.

ddtrace/internal/datadog/profiling/cmake/FindLibNative.cmake            @DataDog/profiling-python
ddtrace/internal/datadog/profiling/cmake/NativeHeaders.cmake            @DataDog/profiling-python
ddtrace/internal/datadog/profiling/dd_wrapper/src/sample.cpp            @DataDog/profiling-python
ddtrace/internal/datadog/profiling/ddup/CMakeLists.txt                  @DataDog/profiling-python
ddtrace/internal/datadog/profiling/stack/CMakeLists.txt                 @DataDog/profiling-python
ddtrace/internal/datadog/profiling/stack/echion/echion/cpython/tasks.h  @DataDog/profiling-python
ddtrace/internal/datadog/profiling/stack/fuzz/CMakeLists.txt            @DataDog/profiling-python
ddtrace/internal/datadog/profiling/stack/src/echion/frame.cc            @DataDog/profiling-python
ddtrace/internal/datadog/profiling/stack/test/CMakeLists.txt            @DataDog/profiling-python
ddtrace/internal/datadog/profiling/stack/test/test_cpython_layout_contracts.cpp  @DataDog/profiling-python
ddtrace/internal/datadog/profiling/stack/test/test_frame_state_315.cpp  @DataDog/profiling-python