Refactor maturity analytics helpers

[ccf]

Summary

• Extract toolchain reliability aggregation out of the monolithic maturity analytics service
• Extract harness configuration fingerprint construction into a dedicated helper module
• Extract project readiness and context quality scoring into a dedicated helper module
• Keep the public maturity analytics API/response behavior unchanged while shrinking the orchestration service

Tests

• ruff check .
• ruff format --check .
• bandit -r src/ -c pyproject.toml
• pytest --import-mode=importlib tests/test_maturity.py -q
• pytest --import-mode=importlib -q (963 passed)

Notes

• Backend-only refactor; no frontend/UI changes.
• Existing untracked screenshot/audit artifacts were left untouched.

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Note

Low Risk
Low risk refactor that mostly moves existing maturity analytics aggregation logic into dedicated helper modules; main risk is subtle regression in scoring/sorting due to code movement and new helper boundaries.

Overview
Refactors maturity_service.get_maturity_analytics by extracting three large analytics builders into dedicated modules: toolchain reliability (maturity_reliability.py), harness configuration fingerprints (maturity_harness_fingerprints.py), and project readiness/context quality scoring (maturity_context_quality.py).

The service now delegates to build_toolchain_reliability, build_harness_configuration_fingerprints, and build_project_readiness_and_context_quality, removing inlined helper functions and duplicated computations (e.g., context_signal_count) while keeping the response shape and ordering logic the same.

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