slopless 0.2.18

New slop signals, from comparing against grahamrowe82/antislop and reviewing each against real text.

• Honesty-advertising and throat-clearing openers: "To be clear,", "Honestly,", "Frankly,", "Here's the thing", "In all honesty", and similar, flagged at the start of a sentence.
• Hype/business clichés: world-class, next-level, supercharge, table stakes, north star, best-in-class.
• "stands as a testament to".

A proposed en-dash check was tested against the corpus and the fixture set, then dropped: it produced only false positives (legitimate compounds and symbol definitions), no real slop. The closed em dash is unchanged.