Phase 1 Step 5. Fold lib/utils.js (flat Markdown collections) and
lib/livesData.js (year-foldered ParVagues gigs) into one module,
lib/content/index.ts — two collection shapes in one entry, not one
forced shape. Thin section wrappers (posts/hydras/poems/talks) now
re-export from @/lib/content; the two ParVagues pages import the lives
API from there too. Old lib/utils.js and lib/livesData.js deleted.

- strip the per-file console.log noise that was in lib/utils.js;
- getAllContentIds now returns plain string[]; the three dynamic pages
  drop the vestigial Pages-Router `.map(({params}) => params)` adapter
  for `.map((id) => ({ id }))`;
- add lib/content/parvagues-presence.ts: a single thin seam holding the
  already-in-repo platform links, so a future tooling-emitted
  presence.json swaps in without touching components. No schema, no
  invented links, components not yet rewired (deliberate).

Verified: prod build green (14 routes, all dynamic params intact);
fresh-dev smoke 14/14.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>