Add hook dispatch probes to isolate why bash-guard never fires

Registers five inert probe entries covering the 2x2 of timeout and
statusMessage on PreToolUse:Bash, plus a PostToolUse statusMessage cell.
Each probe is in its own matcher block so a dropped entry cannot take
the others with it, and logs its identity before reading stdin so a
failed dispatch stays distinguishable from a failed payload read.

The real bash-guard entry is unchanged and serves as the control.

plugins/guards/hooks/hooks.json

@@ -11,6 +11,46 @@
             "statusMessage": "Checking jj/attribution policy; gating push on build + tests..."
           }
         ]
+      },
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/hooks/probe.mjs\" P1-plain"
+          }
+        ]
+      },
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/hooks/probe.mjs\" P2-timeout-only",
+            "timeout": 600
+          }
+        ]
+      },
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/hooks/probe.mjs\" P3-status-only",
+            "statusMessage": "probe P3 status-only"
+          }
+        ]
+      },
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/hooks/probe.mjs\" P4-both",
+            "timeout": 600,
+            "statusMessage": "probe P4 both"
+          }
+        ]
       }
     ],
     "PostToolUse": [
@@ -23,6 +63,16 @@
             "timeout": 5
           }
         ]
+      },
+      {
+        "matcher": "Write|Edit|MultiEdit",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/hooks/probe.mjs\" P5-post-status",
+            "statusMessage": "probe P5 post status"
+          }
+        ]
       }
     ]
   }