Opener Variator (H3 first paragraph rewrite)

Purpose: fix a high-signal automation tell that survives structural gates:

• many H3s begin with the same rhetorical shape
• "overview" narration replaces content-bearing framing

This skill is intentionally narrow:

• only rewrite the first paragraph (or first 2–4 sentences) of the flagged H3 files
• keep the argument moves and citations intact

Inputs

Required:

• output/WRITER_SELFLOOP_TODO.md (Style Smells section)
• the referenced sections/S<sub_id>.md files

Optional (helps you stay aligned):

• outline/writer_context_packs.jsonl (use opener_mode, tension_statement, thesis)