feat(voice): wire sample precedence and non-fabrication

[edithatogo]

Summary

• A calibrated sample still outranks the dash ban; Never add, Never lose, and protected spans still win.
• Corpus facts may inform voice. They cannot be inserted into the current draft unless the user asks and the current source already supports the claim.
• Skip PERSONALITY AND SOUL and first-person texture for clinical, legal, regulatory, and submitted academic material even when a first-person corpus is available.

Conductor: voice-corpus-calibration_20260811 Phase 4. Track #279.

Test plan

• Precedence and non-fabrication unit tests
• CI npm test

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[codecov]

Codecov Report

❌ Patch coverage is 98.33333% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
scripts/lib/document-intake-policy.js	98.33%	1 Missing ⚠️

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