feat(configs): expand directory topics and add 12 verified live feed configs

[gildesmarais]

What changed

• 12 new feed configs under lib/html2rss/configs/:
  • aleph-alpha.com/news.yml, banrep.gov.co/noticias.yml, bostondynamics.com/news.yml, embl.org/news.yml, fdic.gov/press-releases.yml, figure.ai/news.yml, ipcc.ch/news.yml, press.un.org/press-releases.yml, replicate.com/changelog.yml, resend.com/changelog.yml, scale.com/blog.yml, together.ai/blog.yml
• 17 existing configs retagged to use expanded directory.topics slugs already in the core validator (health, education, rights, transport):
  • University news: science → education (aalto, anu, chalmers, ethz, imperial, kaist, ntu, tudelft, tue)
  • Health agencies: science → health (who, ecdc); MSF adds health
  • Courts: add rights (curia, icj)
  • Transport agencies: add transport (dfs, faa, imo)

Configs-only PR — skill/docs changes from the original branch were dropped; master already has the curation workflow update (#322).

Why

Feed Directory browse needs configs tagged with the newer topic vocabulary, plus a batch of live-verified surfaces (AI vendors, changelogs, civic/finance/regulatory news) that were missing from the catalog.

Risk

• Selector drift on JS-heavy or redesign-prone sites (replicate/resend changelogs, AI vendor blogs)
• Topic retags are metadata-only — no selector or URL changes on existing configs
• Low merge conflict risk with other in-flight config PRs if they touch the same retagged files

Review map

1. New configs (12 files) — spot-check selectors and directory.title / summary on one changelog (replicate.com/changelog.yml), one civic (press.un.org/press-releases.yml), one finance (fdic.gov/press-releases.yml)
2. Topic retags (17 files) — confirm directory.topics only; no accidental selector edits
3. Dynamic fetch lane — new configs will be picked up by spec/html2rss/configs_dynamic_spec.rb on CI

Validation

Original branch verification (pre-rebase onto current master):

• bin/validate_configs — all configs passed
• bundle exec rspec spec/ — 1,574 examples, 0 failures
• yamllint, rubocop, Prettier — clean

Not re-run after rebase onto 0d80e4b (configs-only rewrite). CI on this PR is the authoritative re-check.