Root cause: harvest.js fetched content but wrote NO files — it dumped a
giant manifest (with full body) to stdout and left all document I/O to
the agent. This caused silent save failures (agent hand-wrote fragile
Node scripts) and token waste (full body in context → 13 python re-parses).

Architecture change — scripts do all deterministic I/O, full body never
enters the agent context:

  Archive:  harvest.js <src> <n>  → writes 原文.md + registry + index
                                     (sentinel placeholder for 中文标题)
                                     + compact manifest (bodyPreview only)
            agent writes .summaries.json (中文标题 + 四段摘要 + 分类)
            finalize.js <dayDir>    → writes 摘要.md, patches sentinels,
                                     updates registry/index, cleans up

  Preview:  harvest.js <src> <n> --preview [--full]  → read-only, no writes

Changes:
- harvest.js: wire up generateOriginalDoc/updateIndex/appendRegistry
  (were defined but never called); compact manifest (no full body);
  sentinel placeholder links; --preview/--full read-only mode; real
  asset count (was "articles with images"); empty-alt guard (no bare **);
  manifest merge across runs (fixes dangling-sentinel data loss);
  --help; module exports for finalize.js
- finalize.js (new): consumes .manifest.json + .summaries.json, writes
  summary docs, patches sentinel links, updates registry/index, cleans
  up temp files; missing summary → warn + skip (non-fatal); --help
- fetcher-direct.js: author extraction via JSON-LD → <meta name=author>
  → rel=author (was matching arbitrary JSON-LD names → empty authors);
  body noise filter (share buttons, boilerplate); image tracking-pixel
  + duplicate filtering
- fetcher-browser.js: CDP port 9223 → 9222 (match docs/chromium launch)
- SKILL.md: 3-step archive workflow, --preview flow, First-Run Setup
  onboarding, guardrails, .summaries.json contract, sentinel docs
- README.md: architecture diagram, division of labor, task flows, limits