feat: add Rust voiceprint scoring kernel

[MapleEve]

Summary

• add an optional Rust voiceprint scoring kernel behind RUST_KERNEL_MODE=required
• keep Python scoring as the default path and preserve the public voiceprint result contract
• fail closed on Rust bridge import, call, top-level response, candidate response, and non-finite score errors
• extend the Rust heavy gate Docker smoke to exercise the voiceprint kernel

Validation

• python -m pytest tests/unit -q
• python -m pytest tests/test_voiceprint_db.py -q
• python -m pytest tests/unit/test_voiceprint_scoring_kernel.py tests/unit/test_kernel_bridge.py tests/test_voiceprint_db.py -q
• python -m pytest tests/unit/test_audio_layers.py::test_voiceprint_match_provider_uses_identify_threshold_when_supplied tests/unit/test_provider_registry.py::test_default_providers_are_listed_and_resolvable tests/unit/test_pipeline_runner.py::test_runner_dispatches_pipeline_steps_through_provider_registry -q
• cargo test --manifest-path crates/voscript_core/Cargo.toml
• cargo clippy --manifest-path crates/voscript_core/Cargo.toml --features python-bindings --all-targets -- -D warnings
• cargo fmt --manifest-path crates/voscript_core/Cargo.toml -- --check
• cargo check --manifest-path crates/voscript_core/Cargo.toml --features python-bindings
• ruff format --check app/ tests/unit/test_kernel_bridge.py tests/unit/test_voiceprint_scoring_kernel.py tests/test_voiceprint_db.py
• ruff check app/ tests/unit/test_kernel_bridge.py tests/unit/test_voiceprint_scoring_kernel.py tests/test_voiceprint_db.py --ignore E501
• git diff --check
• public release scan passed

Notes

• Live API E2E was not counted locally because the current shell did not provide live service credentials; CI heavy gate should validate Rust wheel and Docker packaging on PR open.

[codecov]

Codecov Report

❌ Patch coverage is 91.89189% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.59%. Comparing base (4ecfdbe) to head (b6ca0b8).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
app/voiceprints/scoring.py	88.17%	11 Missing ⚠️
app/voiceprints/db.py	85.71%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
+ Coverage   91.39%   91.59%   +0.20%     
==========================================
  Files          79       79              
  Lines        3149     3333     +184     
==========================================
+ Hits         2878     3053     +175     
- Misses        271      280       +9     

Flag	Coverage Δ
unit	91.59% <91.89%> (+0.20%)	⬆️

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[claude]

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[Copilot]

Pull request overview

This PR introduces a Rust implementation of the voiceprint scoring kernel (selected only when RUST_KERNEL_MODE=required), while keeping the Python scoring behavior as the “golden oracle” and preserving the public voiceprint decision contract.

Changes:

• Added a Rust voiceprint scoring kernel (voscript_core::voiceprint) with Python bindings and a fail-closed Python bridge (providers.kernel_bridge.voiceprint_score).
• Extended voiceprint scoring tests (Python oracle + Rust golden cases) and updated DB identify flow to route scoring through the Rust kernel when required.
• Updated docs, CI heavy-gate smoke, and bumped voscript_core version to 0.8.1.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/unit/test_voiceprint_scoring_kernel.py	Adds Python oracle golden tests plus Rust bridge response-validation tests.
tests/unit/test_kernel_bridge.py	Updates extension smoke expectations for version 0.8.1.
tests/test_voiceprint_db.py	Adds DB-level tests to ensure Rust routing + fail-closed behavior in required mode.
doc/configuration.zh.md	Documents that the currently selected Rust path is voiceprint scoring.
doc/configuration.en.md	Documents that the currently selected Rust path is voiceprint scoring.
doc/changelog.zh.md	Adds changelog entries for the Rust voiceprint scoring kernel and extended tests.
doc/changelog.en.md	Adds changelog entries for the Rust voiceprint scoring kernel and extended tests.
crates/voscript_core/tests/voiceprint_scoring.rs	Adds Rust-side golden tests for voiceprint scoring behavior.
crates/voscript_core/src/voiceprint.rs	Implements the Rust voiceprint scoring kernel logic (raw + AS-norm).
crates/voscript_core/src/lib.rs	Exposes the Rust kernel and adds the voiceprint_score PyO3 binding.
crates/voscript_core/Cargo.toml	Bumps voscript_core to 0.8.1.
Cargo.lock	Updates lockfile for the voscript_core version bump.
app/voiceprints/scoring.py	Introduces a Python “oracle” API/contract for scoring candidates.
app/voiceprints/db.py	Routes identify scoring through Rust kernel when required, and builds Rust payloads.
app/providers/kernel_bridge/runtime.py	Adds fail-closed Rust bridge call + response validation for voiceprint_score.
app/providers/kernel_bridge/__init__.py	Exports voiceprint_score from the kernel bridge package.
.github/workflows/rust-foundation-heavy.yml	Ensures clippy runs with python-bindings and smoke-tests voiceprint_score in Docker.

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