AI Implementation feature(1087): Mastodon Post Composition and Publishing (#6)

docs/guides/daily-run.md

@@ -29,9 +29,12 @@ scheduled tick.
 Before scanning, the process ensures the configured blog repository exists
 under `/app/data/blog` and is fast-forwarded from `BLOG_REPO_URL`. It then
 walks `_posts/blog/**/*.md`, finds posts whose date is exactly ten years
-before today, skips IDs already present in `posted.json`, and records new
-relative paths. The current implementation records matching IDs only;
-Mastodon publication is not yet wired.
+before today, skips IDs already present in `posted.json`, composes a
+single German-language Mastodon status (default prefix
+`Heute vor 10 Jahren:`) listing each new match's title and canonical URL
+followed by the configured hashtags, and — only after the Mastodon API
+call succeeds — records the relative paths of the published posts in
+`posted.json`.
 
 # What You Should See
 
@@ -42,7 +45,7 @@ The bot uses a **JSON-per-line** logger that writes to
 should show output similar to:
 
 ```json
-{"ts": "2026-08-04T09:00:00+00:00", "level": "INFO", "logger": "tenbackward", "message": "startup", "event": "startup", "version": "0.1.0", "site_url": "https://blog.example.com", "run_at": "09:00", "tz": "Europe/Berlin", "hashtags": "#throwback,#10backward", "throwback_prefix": "Throwback:"}
+{"ts": "2026-08-04T09:00:00+00:00", "level": "INFO", "logger": "tenbackward", "message": "startup", "event": "startup", "version": "0.1.0", "site_url": "https://blog.example.com", "run_at": "09:00", "tz": "Europe/Berlin", "hashtags": "#throwback,#10backward", "throwback_prefix": "Heute vor 10 Jahren:"}
 ```
 
 On the current scaffold (`_iter_candidates` is intentionally empty),