lmcp 0.5.3-1: hub hardening — hard ssh timeout, parallel probes, sticky DOWN cache

arch/lmcp/PKGBUILD

@@ -3,7 +3,7 @@
 # Source of truth: git.reauktion.de/marfrit/lmcp
 
 pkgname=lmcp
-pkgver=0.5.2
+pkgver=0.5.3
 pkgrel=1
 pkgdesc="Lightweight MCP (Model Context Protocol) server in pure Lua"
 arch=('any')
@@ -11,7 +11,7 @@ url="https://git.reauktion.de/marfrit/lmcp"
 license=('MIT')
 depends=('lua' 'lua-socket')
 source=("${pkgname}-${pkgver}.tar.gz::https://git.reauktion.de/marfrit/lmcp/archive/v${pkgver}.tar.gz")
-sha256sums=('5a5945e6f2511f440de8e961b82ec3deaab5e77cc9208c9999e831fbc33d702d')
+sha256sums=('9ee3acf3139db375f79f1ce19f97386ba017a4ed24f3bb6be9b90dc5a2c10bb4')
 
 package() {
     cd "${pkgname}"

debian/lmcp/debian/changelog

@@ -1,3 +1,20 @@
+lmcp (0.5.3-1) bookworm trixie; urgency=medium
+
+  * hub.lua: hard wall-clock cap on ssh fallback via `timeout` —
+    prevents event-loop wedges on half-dead sshd (auth stall, remote
+    bash-s hang). Configurable via LMCP_HUB_SSH_HARD_TIMEOUT.
+  * hub.lua: parallel lmcp probes for remote_list_hosts. Wall clock
+    for a 12-backend fleet with 8 offline hosts drops from ~28 s
+    (sequential ssh timeouts) to ~3 s.
+  * hub.lua: probe is lmcp-only, not ssh. Actual remote_* calls still
+    fall through to ssh fallback when lmcp is down.
+  * hub.lua: sticky DOWN cache with exponential backoff (60 → 120 →
+    240 → 480 → 900 s). UP hosts still 30 s TTL.
+  * hub.lua: per-request stderr logging (tool/host/via/elapsed) for
+    future RCA.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Tue, 21 Apr 2026 14:10:00 +0000
+
 lmcp (0.5.2-1) bookworm trixie; urgency=medium
 
   * server.lua: new shell_bg tool launches detached commands via