feat: two-stage Lidarr discovery + Emby→arr sync tools

Lidarr Discovery (playback_aware_lidarr_discovery.sh):
- Complete rewrite to two-stage pipeline: Stage 1 scores weekly Emby
  plays → top seeds; Stage 2 runs Last.fm getSimilar on seeds → scores
  candidates → adds top 0-5 to Lidarr
- Per-user influence cap (35%) prevents single listener dominating discovery
- Requires 2+ seeds to accept a candidate (single-seed skipped)
- Last.fm similarity limit 10 for tighter, higher-quality candidates
- 30-day reject cooldown history; MAX_ADDS=5 cap enforced
- Root folder fetched from Lidarr API at runtime (no config path)
- Added to WEEKLY_MAINTENANCE_SCRIPTS (uncommented)

Emby→arr sync tools (Tools/):
- emby_to_lidarr_sync.sh: finds Emby music artists not in Lidarr, adds them
  - Dirty tag filter: comma-list, feat./ft., &, vs, " - " patterns skipped
  - Root folder fetched from Lidarr API at runtime
- emby_to_sonarr_sync.sh: finds Emby series not in Sonarr, adds them
  - TVDB ID matching with title fallback
- emby_to_radarr_sync.sh: finds Emby movies not in Radarr, adds them
  - TMDB ID matching with title fallback
- All three: searchForMissing*: false (monitoring only, no searches triggered)
- All three documented in Tools/Manual-Tools.md

Tools/Manual-Tools.md

@@ -8,6 +8,9 @@ making any changes.
 
 ## ━━━ CONTENTS ━━━
 
+- [emby_to_lidarr_sync.sh](#emby_to_lidarr_syncsh)
+- [emby_to_sonarr_sync.sh](#emby_to_sonarr_syncsh)
+- [emby_to_radarr_sync.sh](#emby_to_radarr_syncsh)
 - [failover_state_reset.sh](#failover_state_resetsh)
 - [watchdog_skip_list_manager.sh](#watchdog_skip_list_managersh)
 - [bulk_permissions_repair.sh](#bulk_permissions_repairsh)
@@ -21,6 +24,104 @@ making any changes.
 
 ---
 
+## emby_to_lidarr_sync.sh
+
+One-shot bootstrap tool. Scans Emby play history, finds artists you've actually
+listened to that are not yet tracked in Lidarr, and adds them. No scoring — if
+it was played, Lidarr should monitor it. Not scheduled; run manually when you
+want to close the gap between what's in your library and what Lidarr watches.
+
+### When to Use
+
+- After initial Lidarr setup — bring it in line with existing listening history
+- After a Lidarr database wipe or migration
+- Any time you suspect artists you listen to are slipping through unmonitored
+
+### Usage
+
+```bash
+# See what would be added (no changes)
+bash Tools/emby_to_lidarr_sync.sh --dry-run
+
+# Limit to recent plays only
+bash Tools/emby_to_lidarr_sync.sh --dry-run --days 30
+
+# Run for real
+bash Tools/emby_to_lidarr_sync.sh
+```
+
+### Notes
+
+- Reads completions from the Emby activity log (`has finished playing` events)
+- Filters out VA, Various Artists, and other metadata placeholders
+- Uses `searchForMissingAlbums: false` — adds monitoring without triggering a
+  full album search; run Lidarr's own missing-album search afterwards if desired
+- Activity log has a finite history; use `--days N` if the log has been pruned
+
+---
+
+## emby_to_sonarr_sync.sh
+
+One-shot bootstrap tool. Finds TV series present in Emby that are not tracked in
+Sonarr and adds them. Uses TVDB ID matching when available (more reliable than
+title matching), falling back to case-insensitive title comparison.
+
+### When to Use
+
+- After initial Sonarr setup — bring it in line with your existing library
+- After a Sonarr database wipe or migration
+- Any time series you own are slipping through unmonitored
+
+### Usage
+
+```bash
+# See what would be added (no changes)
+bash Tools/emby_to_sonarr_sync.sh --dry-run
+
+# Run for real
+bash Tools/emby_to_sonarr_sync.sh
+```
+
+### Notes
+
+- Uses `searchForMissingEpisodes: false` — adds monitoring without triggering
+  episode searches; Sonarr's library scan will pick up existing files
+- Adds to the first accessible root folder in Sonarr (`/tv` by default)
+- TVDB ID match preferred over title; title fallback handles edge cases
+
+---
+
+## emby_to_radarr_sync.sh
+
+One-shot bootstrap tool. Finds movies present in Emby that are not tracked in
+Radarr and adds them. Uses TMDB ID matching when available, falling back to
+case-insensitive title comparison.
+
+### When to Use
+
+- After initial Radarr setup — bring it in line with your existing library
+- After a Radarr database wipe or migration
+- Any time movies you own are slipping through unmonitored
+
+### Usage
+
+```bash
+# See what would be added (no changes)
+bash Tools/emby_to_radarr_sync.sh --dry-run
+
+# Run for real
+bash Tools/emby_to_radarr_sync.sh
+```
+
+### Notes
+
+- Uses `searchForMovie: false` — adds monitoring without triggering movie
+  searches; Radarr's library scan will pick up existing files
+- Adds to the first accessible root folder in Radarr (`/movies` by default)
+- TMDB ID match preferred over title; title fallback handles edge cases
+
+---
+
 ## failover_state_reset.sh
 
 Resets the fallback state file to NORMAL and clears all tier flags. State file only —