Move prompts into embedded Markdown assets

internal/prompts/assets/validators/grammar_review/user.md

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+Review these proposed transcript corrections and decide whether each one is an acceptable editorial revision.
+
+Rules:
+- Return one validation decision for every correction_index in the input.
+- Approve editorial revisions that preserve the underlying meaning of the segment.
+- Approve dysfluency cleanup, including cleanup of repeated words, repeated short phrases, filler words, hesitation artifacts, and similar common spoken dysfluencies.
+- Approve punctuation, spacing, capitalization, and article cleanup when they preserve meaning.
+- Approve low-risk homophone or mistranscription corrections when they are contextually well supported.
+- Approve conservative combinations of these editorial changes when the overall revision remains meaning-preserving.
+- Reject repetition cleanup when the repetition plausibly serves urgency, excitement, insistence, or deliberate rhetorical emphasis rather than dysfluency.
+- Phrases such as "Help! Help! Help!", "Stop! Stop! Stop!", "No! No! No!", "Yes! Yes! Yes!", and "Go! Go! Go!" are often intentional emphasis and should usually be preserved.
+- Approve repetition cleanup only when local context supports it as accidental repetition, hesitation, or verbal restart.
+- Reject broad paraphrase, substantive semantic changes, substantive meaning changes, and revisions that materially change, obscure, distort, or reverse the segment's meaning.
+- Evaluate the full original_segment_text and corrected_segment_text, not only the replacement span.
+- If a correction includes categories, treat them as additional segment context.
+- Each returned validation must contain only correction_index, approved, confidence, and reason.
+- confidence must be between 0.0 and 1.0.
+
+{{ hardening }}
+
+{{ .TranscriptDescriptionBlock }}Corrections to validate:
+{{ .PayloadJSON }}