Add §31 conversational rhetorical openers; extend §20 with offer-to-continue closers

[gounthar]

What

• New §31 "Conversational Rhetorical Openers": catches the standalone "Honestly?" hook (also "Look,", "Here's the thing,", "Real talk,"). The pattern is a one-word question on its own line, a beat, then the "real" answer.
• Extended the §20 watch-list with "Want me to…?", "Want me to give some examples?", "Should I continue?". The offer-to-continue closer was already half-covered by the existing "Would you like…" example, so I added to that section instead of duplicating it.
• Added a "What NOT to flag" bullet so a real person's mid-sentence "honestly" or "look" survives. Only the theatrical standalone opener should trip the rule.
• Bumped the version 2.7.0 → 2.8.0.

Why

Both came up a lot in a recent thread where people were comparing notes on AI tells. "Honestly?" as an opener and "Want me to give some examples?" as a closer each got called out by name. They fit the existing catalogue and I couldn't find them covered yet.

I left out "quietly" and "weird/weirder" from the same thread on purpose. They felt too prone to false positives, and a banned-word list cuts against the clustering philosophy already in DETECTION GUIDANCE. Happy to reconsider if you see it differently, or if you'd rather fold §31 into an existing section.

Test plan

• Re-read both new sections against the existing format for consistency.
• Checked the additions for em/en dashes and forced rule-of-three (none).