Freeze the semantic support candidate

[b1rdmania]

Summary

• add an exact-first/frozen-fallback detector composition for support bake-offs
• freeze the single AlignScore NLI candidate and 0.50 abstention threshold using only the exploratory pack
• correct the circular plan instruction: candidates run under the frozen probe plan and enter the production admitted registry only after a passing artifact
• bind exact routing, fallback identity, threshold, and policy hash before recorded review
• bump the package to v0.1.0a12

Verification

• python3.12 -m pytest -q (307 passed)
• frozen policy SHA-256: 1e0b4705bc3c8ff57d161b8c95ac4e4f37bb34012156bbd09a0a6c9fbe6a318b

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

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Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: da7602f6-b8ef-4d03-91ce-f35a4a7d8885

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