Sync READMEs and manuals to current script headers

Fix discrepancies found by auditing docs against headers:
- stability_watchdog.sh: wrong variable name (STRIKES → STRIKE_LIMIT) and wrong default (2hr → 12hr) in header
- Watchdogs manual: REBOOT_WINDOW_HRS example value was 2, should be 12
- Transcodes README: transcode_cleanup/manager table said "Every 3 min", should be "Every 7 minutes"
- Tools manual: fallback_state_reset.sh still marked "not yet built" — rewrite section to reflect current script
- Tools manual: claude_startup --setup flag doesn't exist; modes were inverted — fix and add --launch
- Tools README + manual: add docker_prune_images.sh (existed but undocumented)
- Tools manual: add play_state_sync.sh --full to flag reference
- Orchestrators README: arrs_failed_stalled_recovery runs via intermediate_sync (every 4hr), not standalone every 6hr
- Plugin README: add build.sh to scripts table
- Partnership README + manual: add partnership_transfer.sh and onboard_cancel.sh to script tables and flag reference

Partnership/README-Partnership.md

@@ -141,7 +141,9 @@ independently at 4-hour cadence.
 | `partnership_onboard.sh` | One-time setup — SSH keys, stack deploy, arr bootstrap | Manually, once per server per partnership |
 | `partnership_offboard.sh` | Clean separation — both paths, both roles | Via `partnership_manager.sh --offboard`; or directly |
 | `partnership_manager.sh` | Dispatcher + monitor — onboard WebUIs, health check, transfer, status | `--check` every 30min; all other modes manually |
+| `partnership_transfer.sh` | Transfer ownership from current owner to current mirror | Via `partnership_manager.sh --transfer`; owner only |
 | `ssh_setup.sh` | SSH key generation, remote install, auth validation | Called by onboard; manually for re-keying or validation |
+| `onboard_cancel.sh` | Remove SSH keys in one or both directions, clear setup flags | During cancelled or failed onboard; manual cleanup |
 
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