Add year-based folders, attribution overlay, notifications, crontab/systemd

season_info.py
- Add ASTRO_YEAR: year of the Winter solstice that started the current cycle
  (Spring/Summer/Autumn 2026 → 2025; Winter Dec-2026 → 2026)

4-seasons.sh
- Daily clip output path now includes ASTRO_YEAR:
  movies/$name/$ASTRO_YEAR/$SEASON/Mvt$N/

montage-mvt.sh (full rewrite)
- Attribution is now a drawtext overlay (top 6 s of the video, fade in/out)
  instead of an appended black card — no frame-size matching needed, and
  year-end join requires no special handling
- Output path mirrors the new year-based folder structure
- Sends notification via notify.sh when done
- Automatically triggers year-end-join.sh after Autumn Mvt 3

year-end-join.sh (new)
- Concatenates all 12 movement montages for a given ASTRO_YEAR
- Output: movies/$name/$ASTRO_YEAR/$name-$ASTRO_YEAR.mp4
- Sends notification when done

notify.sh + notify_config.txt (new)
- Generic best-effort notification helper: ntfy, email, Mattermost text post
- All methods disabled by default; user fills in notify_config.txt

sky-cam.crontab + systemd/ (new)
- Crontab file: sunrise at 09:00, 4-seasons at 01:00, fullday at 02:00
- systemd .service + .timer units for all three daily jobs
- montage/year-end triggered internally, not by cron

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

4-seasons.sh

@@ -23,8 +23,9 @@ echo "Processing: $yesterday"
 
 # ── Season / movement info from astronomical calculation ──────────────────────
 eval "$(python3 "$SCRIPT_DIR/season_info.py" "$yesterday")"
-# Provides: SEASON  MVT_NUM  DAY_OF_MVT  DAYS_IN_MVT  MVT_START  MVT_END  IS_LAST_DAY
-echo "Season=$SEASON  Mvt=$MVT_NUM  Day=$DAY_OF_MVT/$DAYS_IN_MVT  LastDay=$IS_LAST_DAY"
+# Provides: SEASON  MVT_NUM  DAY_OF_MVT  DAYS_IN_MVT  MVT_START  MVT_END
+#           IS_LAST_DAY  ASTRO_YEAR
+echo "Season=$SEASON  Mvt=$MVT_NUM  Year=$ASTRO_YEAR  Day=$DAY_OF_MVT/$DAYS_IN_MVT  LastDay=$IS_LAST_DAY"
 
 # ── Locate music file and get its duration ────────────────────────────────────
 music_file=$(find "$music_base_dir" -type f -iname "*${SEASON}*Mvt*${MVT_NUM}*" | sort | head -n 1)
@@ -57,7 +58,7 @@ fi
 echo "Images found: $total_images"
 
 # ── Prepare output directory ──────────────────────────────────────────────────
-output_dir="$base_dir/movies/$script_name/$SEASON/Mvt$MVT_NUM"
+output_dir="$base_dir/movies/$script_name/$ASTRO_YEAR/$SEASON/Mvt$MVT_NUM"
 mkdir -p "$output_dir"
 
 # ── Build sorted image list ───────────────────────────────────────────────────