Document today's restructures, and give data/ a README that ships with it

System_Essentials/Manual-System_Essentials.md

@@ -80,7 +80,7 @@ and the continuous scripts (start_webhook_listener, fallback), which are the fir
 steps that actually touch containers.
 
 Why conf_cache_save is FIRST in ARRAY_STOP_SCRIPTS: the RAM cache at
-`/tmp/.cache/vv/d/` is wiped on reboot. Saving it must happen before anything
+`/tmp/varaverk/conf/` is wiped on reboot. Saving it must happen before anything
 else shuts down or changes state.
 
 ---
@@ -100,10 +100,10 @@ conf_sync.sh --log             Verbose output
 ### What It Syncs
 
 - **Pull**: reads the partner's `Configurations/${partner_id}.conf` from their disk
-  via SCP → writes to local `/tmp/.cache/vv/d/${partner_id}.conf`
+  via SCP → writes to local `/tmp/varaverk/conf/${partner_id}.conf`
 - **Push**: sends own `Configurations/${my_id}.conf` to partner's
-  `/tmp/.cache/vv/d/${my_id}.conf` via SCP
-- **Own conf in local cache**: copies own conf to `/tmp/.cache/vv/d/${my_id}.conf`
+  `/tmp/varaverk/conf/${my_id}.conf` via SCP
+- **Own conf in local cache**: copies own conf to `/tmp/varaverk/conf/${my_id}.conf`
   on full sync (so the cache has a complete snapshot of all confs)
 
 Only partner confs are sourced from cache — `load_config.sh` always reads own conf
@@ -136,7 +136,7 @@ A notification fires if any partner fails — check partner reachability via Tai
 
 ### What It Does
 
-At array stop, copies all partner confs from `/tmp/.cache/vv/d/` to
+At array stop, copies all partner confs from `/tmp/varaverk/conf/` to
 `$PERSISTENT_CONF_CACHE`. Own conf is skipped (always on disk). The backup survives
 the reboot and is used by `conf_cache_restore.sh` at next array start if the sync
 can't reach the partner.
@@ -164,7 +164,7 @@ conf_cache_save.sh --log        # verbose output
 ### What It Does
 
 At array start (after `conf_sync.sh`), checks which partner confs are missing from
-`/tmp/.cache/vv/d/`. For each missing conf, loads it from `$PERSISTENT_CONF_CACHE`
+`/tmp/varaverk/conf/`. For each missing conf, loads it from `$PERSISTENT_CONF_CACHE`
 if a backup exists there.
 
 Always removes the persistent backup when done — whether used or not. On a normal
@@ -434,8 +434,8 @@ REBOOT_VM_WAIT=30
 # STATE_DIR and PERSISTENT_CONF_CACHE are derived from SCRIPTS_DIR in master.conf.
 # They adapt to internal (/boot/config/plugins/varaverk) or appdata storage mode
 # (/mnt/user/appdata/Varaverk) automatically — do not hardcode paths.
-STATE_DIR="${SCRIPTS_DIR}/State_Files"
-PERSISTENT_CONF_CACHE="${SCRIPTS_DIR}/.cache/vv/d"
+STATE_DIR="${DATA_DIR}/state"
+PERSISTENT_CONF_CACHE="${CACHE_BACKUP_DIR}/conf"
 ```
 
 ---
@@ -446,7 +446,7 @@ PERSISTENT_CONF_CACHE="${SCRIPTS_DIR}/.cache/vv/d"
 
 ```bash
 # Check what's in the RAM cache:
-ls -la /tmp/.cache/vv/d/
+ls -la /tmp/varaverk/conf/
 
 # Check what's in the persistent backup:
 ls -la "$PERSISTENT_CONF_CACHE/"    # set SCRIPTS_DIR first or use full path