Merge branch 'active-bug'

PostToolUseFailure incorrectly marked the session idle on transient tool
errors. PreToolUse keeps the active signal fresh throughout tool execution,
while Stop alone handles the transition to idle.

src/vm.ts

@@ -204,8 +204,8 @@ async function configureEnvironment(home: string, apiKey: string): Promise<void>
   const activityBin = `/home/${USER}/.local/bin/sandlot-activity`
   const hooks = {
     UserPromptSubmit: [{ hooks: [{ type: "command", command: `${activityBin} active` }] }],
+    PreToolUse: [{ hooks: [{ type: "command", command: `${activityBin} active` }] }],
     Stop: [{ hooks: [{ type: "command", command: `${activityBin} idle` }] }],
-    PostToolUseFailure: [{ hooks: [{ type: "command", command: `${activityBin} idle` }] }],
   }
   const statusLine = { type: "command", command: `/home/${USER}/.local/bin/sandlot-statusline` }
   const settingsJson = JSON.stringify({ apiKeyHelper: "~/.claude/api-key-helper.sh", skipDangerousModePermissionPrompt: true, hooks, statusLine })