Read-time: full-article "Full story · ~N min" badge (Option B)

Replaces the gist-based read-time with the SOURCE article's full read time — the
contrast that sells the gist ("calm 1-min version here; ~10 min for the deep dive").

- goodnews/readtime.py: word_count_from_html (strips script/style/nav/header/
  footer/form/button/aside furniture before counting) + source_read_minutes
  (~225 wpm, 200-word floor, None when extraction looks failed/too thin).
- articles.source_words + read_checked_at columns (count only, never the body;
  fits the privacy posture). Idempotent migration.
- enrich.fetch_source_words + enrich_read_times: a bounded, retry-guarded cycle
  step (mirrors the image enrichers) that counts words for recent accepted
  articles. Only ever writes a real count; never overwrites good with zero. Wired
  into the cycle after recent-image enrichment.
- queries: source_words flows through _ARTICLE_COLUMNS; api exposes
  source_read_minutes on Article (null when unknown).
- home3: News card shows "Full story · ~N min", hidden entirely when null (no
  misleading "1 min").
- Tests: furniture stripping, threshold/rounding, enrich idempotency + no
  zero-overwrite, API null handling. 412 backend.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

goodnews/cli.py

@@ -14,7 +14,7 @@ from .localtime import local_today
 from .dedup import DEFAULT_THRESHOLD, DEFAULT_WINDOW_DAYS, cluster_duplicates, dedup as run_dedup
 from .geo import tag_articles as tag_geo
 from . import art, onthisday, quote, wotd
-from .enrich import enrich_brief_images, enrich_recent_images, enrich_summarized_images
+from .enrich import enrich_brief_images, enrich_read_times, enrich_recent_images, enrich_summarized_images
 from .summarize import generate_summary, get_summary
 from .feeds import (
     fetch_feed,
@@ -599,6 +599,15 @@ def _run_cycle_locked(conn: sqlite3.Connection, args: argparse.Namespace) -> Non
         except Exception as exc:
             print(f"recent images: skipped ({exc})")
 
+        # Full-article read-times: count words for recent accepted articles so the
+        # front door can show "Full story · ~N min" next to our gist (bounded per cycle).
+        try:
+            reads = enrich_read_times(conn)
+            if reads:
+                print(f"read-times: {reads} counted")
+        except Exception as exc:
+            print(f"read-times: skipped ({exc})")
+
         # Pre-warm summaries for today's brief so Today reads as a calm briefing.
         # Idempotent: cached items are skipped, so this only hits the LLM for new ones.
         try: