site: catch the live page up with the 20-plugin reality

[karanb192]

What

An audit of README + landing page on main found the README already solid (counts, badge, links all check out post #43/#44/#45) but the GitHub Pages catalog stale on three fronts:

1. guard-pack was missing entirely (shipped in feat(guard-pack): all six guards in one Node process #45; the site was last touched in Pluginize all 12 standalone hooks and retire hook-scripts/ #43). It now has card 20 in the marketplace grid with the measured tagline: 38ms per tool call instead of 199ms for six separate installs.
2. Counts and receipts drifted: hero tiles said 19 plugins / 1544 tests / ~80ms per call; the marketplace headline, its subline, the meta description, and the closing pitch all said nineteen. Everything now says 20 plugins / 1570 tests, and the closing line describes the real composition (twelve guardrails, seven workflow tools, one guard pack).
3. Latency claims contradicted the committed bench: ten hook cards claimed ~80ms while bench/RESULTS.md measures ~35ms medians for the guards. Measured cards now carry their bench numbers (~35ms guards and the instructions-audit arm, ~65ms auto-stage, ~115ms format-code); unmeasured ones drop the fake number for honest labels (session-logger "async", notify-permission "webhook"). The hook-author cost table's Node row moved from 50-100ms to the measured 35-115ms spread.

Also clears the page's 32 em and en dashes (decorative terminal chrome, step labels, prose), the last file in the repo carrying any: the repo is now fully dash-free.

Verification

Served locally and eyeballed rendered screenshots at hero, catalog, and marketplace scroll depths: guard-pack card renders, stats tiles show 20/1570/~35ms, scroll-reveal animations intact, no console errors beyond the favicon 404 the server always had.