Opener Variator (H3 first paragraph rewrite)

Triggers & routing

• Trigger: opener variator, opener rewrite, rewrite openers, overview opener, 开头改写, 小节开头, 去overview, 去旁白.

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