Fix dead/incorrect vars and consolidate duplicated logic into common.sh

Codebase-wide audit pass: fixed real bugs (SSH hangs missing BatchMode,
local-outside-function no-ops, variable name collisions, a truncated
ratio calc, wrong state-dir path, DARK vs NO_INTERNET drift, and more),
then pulled logic that was duplicated across multiple scripts — arr
cleanup safety gates, docker restart ordering, container maintenance
stop/restart, watchdog state-file helpers, partnership role resolution,
cert expiry checks, remote node discovery, and TMDB discovery scoring —
into common.sh so each now has a single implementation.

Arrs_Stack/playback_aware_sonarr_discovery.sh

@@ -148,7 +148,6 @@
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 source "$SCRIPT_DIR/../load_config.sh"
-source "$SCRIPT_DIR/../Kernel/decision_engine.sh"
 
 parse_args "$@"
 
@@ -205,7 +204,7 @@ log "$ICON_GEAR Config: threshold=${THRESHOLD} lookback=${LOOKBACK_DAYS}d max-se
 
 [[ "$DRY_RUN" == true ]] && warn "DRY RUN — no shows will be added to Sonarr"
 
-_fmt_rating() { local v="${1:-0}"; echo "${v::-1}.${v: -1}" 2>/dev/null || echo "$v"; }
+# _fmt_rating() — provided by common.sh
 
 # ==============================================================================================
 # ━━━ Status ━━━
@@ -315,37 +314,7 @@ _volume_score() {
     fi
 }
 
-# Stage 2: TMDB vote_average × 10 (0-40)
-_rating_score_s2() {
-    local v="$1"
-    if   (( v >= 80 )); then echo 40
-    elif (( v >= 75 )); then echo 32
-    elif (( v >= 70 )); then echo 25
-    elif (( v >= 65 )); then echo 18
-    elif (( v >= 60 )); then echo 12
-    else                     echo 5
-    fi
-}
-
-# Stage 2: vote count (0-20)
-_votes_score() {
-    local c="$1"
-    if   (( c >= 10000 )); then echo 20
-    elif (( c >= 5000  )); then echo 15
-    elif (( c >= 1000  )); then echo 10
-    elif (( c >= 200   )); then echo 5
-    else                        echo 2
-    fi
-}
-
-# Stage 2: seed breadth (0-40)
-_breadth_score() {
-    local seeds="$1"
-    if   (( seeds >= 3 )); then echo 40
-    elif (( seeds == 2 )); then echo 25
-    else                        echo 10
-    fi
-}
+# _rating_score_s2(), _votes_score(), _breadth_score() — provided by common.sh
 
 # ==============================================================================================
 # ━━━ Fetch Emby Series Library ━━━
@@ -636,9 +605,6 @@ done < <(echo "$SONARR_SERIES_JSON" | jq -r '.[] |
 
 log "${#SONARR_TVDB[@]} series in Sonarr | ${#EMBY_TMDB_IDS[@]} series in Emby"
 
-_in_sonarr() { [[ "${SONARR_TVDB["$1"]+x}" || "${SONARR_TMDB["$2"]+x}" ]]; }
-_in_emby()   { [[ "${EMBY_TMDB_IDS["$1"]+x}" || "${EMBY_TVDB_IDS["$2"]+x}" ]]; }
-
 # ==============================================================================================
 # ━━━ Score Stage 2 Candidates ━━━
 # ==============================================================================================