fix: stabilization pass — fail-closed auth, ai flag validation, lint/config/security hardening, regression tests

17-point code-level audit executed via Explorer->Architect->Builder->Tester->Reviewer;
Reviewer accepted (APPROVE_WITH_NOTES; 3 block-list items resolved):

- security: telegram sender-owner AND-gate + TELEGRAM_OWNER_ID, matrix
  MATRIX_ROOM_ID fail-closed, gpg --passphrase-fd 3 (no argv secret),
  /dev/tcp positional-arg form (checkport/smb-client/share-lib/NET_PROBE),
  eval deny-by-default + --no-command-execution carried by both chat bridges,
  tty-gated --trust; config/{telegram,matrix}.env reference templates
- ai: all ExecStart flags validated against installed llama.cpp
  (requested->error, default->omit+warn, CONFIG_REQUESTED_FLAGS); single-file
  hf download failure rc=1 + no .hf-meta; LLAMACPP_HOST coherent;
  POS_SUBCMDS + metadata gaps closed
- tooling: lint-conventions Bash-native rewrite (~24-30x faster, rules and
  output byte-identical, :num restored); pos system uninstall covers all 12
  libs + scale-tail + flags dir + systemd user units (|| true) + plugin
  markers; anchored .bash_completion/.bashrc removal replaces sed -i '/pos/d'
- config: canonical load_env_file in lib/config-ui.sh (CRLF strip, env-wins,
  XDG, LOADED_ENV_KEYS); 9 tools migrated; entertainment-lib collapsed to
  wrappers; docker-compose deliberately unmigrated (source semantics)
- tests: first committed regression suite — tests/run-tests.sh zero-dep
  runner + make test; 12 files / 179 checks / 0 skip / ~52s; hard skip
  contract; systemd-analyze verify on generated unit PASS

Verified: make gen idempotent; make check green; make lint 0 FAIL, 0 WARN;
make test green; bash -n clean; git diff --check clean. Audit deliverables +
agent reports + AGENT_TODO Done entry included.

lib/ai-providers/llamacpp.sh

@@ -9,15 +9,18 @@
 provider_name() { printf 'Local llama.cpp'; }
 
 provider_default_model() {
-    local port="${LLAMACPP_PORT:-8088}"
+    # Honor LLAMACPP_HOST — must match the address the server binds (default
+    # 127.0.0.1); otherwise the adapter talks to a different host than the one
+    # the server actually listens on.
+    local host="${LLAMACPP_HOST:-127.0.0.1}" port="${LLAMACPP_PORT:-8088}"
     local model
-    model="$(curl -sf "http://127.0.0.1:$port/v1/models" 2>/dev/null | jq -r '.data[0].id // empty')"
+    model="$(curl -sf "http://$host:$port/v1/models" 2>/dev/null | jq -r '.data[0].id // empty')"
     [ -n "$model" ] && printf '%s' "$model" || printf '(no model loaded)'
 }
 
 # $1=model  $2=messages JSON ({"messages":[{role,content}]})  $3=optional system prompt
 provider_generate() {
-    local model="$1" messages="$2" system="${3:-}" port="${LLAMACPP_PORT:-8088}"
+    local model="$1" messages="$2" system="${3:-}" host="${LLAMACPP_HOST:-127.0.0.1}" port="${LLAMACPP_PORT:-8088}"
     local body resp code body_out
     # Build messages array with optional system prompt
     if [ -n "$system" ]; then
@@ -28,7 +31,7 @@ provider_generate() {
     fi
     body="$(printf '%s' "$body" | jq -nc --arg m "$model" --argjson msgs "$body" \
         '{model:$m, messages:$msgs, stream:false}')"
-    resp="$(curl -sS -m 120 -X POST "http://127.0.0.1:$port/v1/chat/completions" \
+    resp="$(curl -sS -m 120 -X POST "http://$host:$port/v1/chat/completions" \
         -H "Content-Type: application/json" \
         --write-out $'\n%{http_code}' \
         --data "$body")" || { echo "request failed (curl exit $?)" >&2; return 1; }
@@ -43,8 +46,8 @@ provider_generate() {
 
 # $1=current default model  → stdout=formatted model list
 provider_models_list() {
-    local model="$1" port="${LLAMACPP_PORT:-8088}" resp code body
-    resp="$(curl -sf "http://127.0.0.1:$port/v1/models" \
+    local model="$1" host="${LLAMACPP_HOST:-127.0.0.1}" port="${LLAMACPP_PORT:-8088}" resp code body
+    resp="$(curl -sf "http://$host:$port/v1/models" \
         --write-out $'\n%{http_code}')" || { echo "server not running" >&2; return 1; }
     code="${resp##*$'\n'}"
     body="${resp%$'\n'*}"