v0.7.0

Answer SEO decisions with Jev (d4a7630)

Add a reusable decision runner and five typed decision families, answered in one
TypeSafe System One call per input. Confident answers produce a plan; answers
inside the confidence band go to a review queue. Nothing is applied automatically.

• pagegraph decide serp — classify the SERP format and score our page's fit,
  intent, and title (aligned | mismatch | review).
• pagegraph decide content — score the content rubric and place page value on
  thin | adequate | strong (pass | flag | review).
• pagegraph decide fit — choose the best existing page for a query, or flag
  cannibalization or a gap (map | cannibalized | gap | review).
• pagegraph decide meta — rank supplied title/description candidates
  (choose: | review).
• pagegraph decide authority — judge a link target's legitimacy, spam, and
  outreach worth, plus its fit (accept | spam | review).
• pagegraph decide links (and the retained links decide) — real reason,
  anchor present, direction (A→B / B→A / both), and relevance, with top-K
  per-source budget selection.

Shared flags: --model, --threshold, --concurrency, --cache, --review-out,
and --budget for links. Every record carries the model id and an input hash.