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

Watchdogs/stability_watchdog.sh

@@ -73,9 +73,9 @@
 # master.conf — System Watchdog section
 #   Full variable listing in master.conf. Key variables:
 #
-#   SYS_WATCHDOG_REBOOT_WINDOW_HRS  — reboot rate limit window (default: 2)
+#   SYS_WATCHDOG_REBOOT_WINDOW_HRS  — reboot rate limit window (default: 12)
 #   SYS_WATCHDOG_MAX_REBOOTS        — max reboots in window before giving up (default: 3)
-#   SYS_WATCHDOG_STRIKES            — consecutive failures before reboot (default: 3)
+#   SYS_WATCHDOG_STRIKE_LIMIT       — consecutive failures before reboot (default: 2)
 #   SYS_WATCHDOG_OOM_LIMIT          — OOM kills/cycle to trigger URGENT bypass (default: 3)
 #   SYS_WATCHDOG_MEM_SHUTDOWN_EXCLUDED — containers exempt from memory shutdown
 #