added rake task logging test

Author: ndbroadbent

AGENTS.md

@@ -33,7 +33,14 @@ All commands use [Task](https://taskfile.dev) - run `task --list` to see all ava
 - Debug a specific test: Add `debugger` statements (developer only)
 - Merge coverage reports: `task ruby:coverage:merge`
 
-**Note**: Rails integration tests are in `rails_test_app/templates/test/integration/`.
+**Rails Integration Tests**: Located in `rails_test_app/templates/test/integration/`. The script automatically copies template files to the test app when you run `scripts/rails_tests.sh`.
+
+**FORCE_RECREATE**: Do NOT use `FORCE_RECREATE=true` unless absolutely necessary. It deletes the entire test app and recreates from scratch, which is slow. Only needed when:
+- Gemfile changes require reinstalling gems
+- Something is fundamentally broken with the cached app
+- Rails version changes (but the script auto-detects this anyway)
+
+For template file changes (tests, rake tasks, etc.), just run `scripts/rails_tests.sh` - it copies templates automatically.
 
 ### Quality Commands
 

rails_test_app/templates/lib/tasks/logging.rake

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+namespace :logging do
+  desc "Test log output for rake task logging tests"
+  task test_output: :environment do
+    Rails.logger.info "Test log message from rake task"
+    Rails.logger.tagged("custom_tag") do
+      Rails.logger.info "Tagged test log message"
+    end
+  end
+end

rails_test_app/templates/test/integration/rake_task_logging_test.rb

@@ -0,0 +1,71 @@
+# typed: true
+# frozen_string_literal: true
+
+require "test_helper"
+require "open3"
+require "timeout"
+
+# Test that rake tasks in production have working logs when LogStruct auto-disables.
+class RakeTaskLoggingTest < ActiveSupport::TestCase
+  def test_rake_task_in_production_has_clean_logs
+    # Simulate production rake task:
+    # - RAILS_ENV=production (LogStruct would enable for servers)
+    # - NOT a server process (rake task)
+    # - LogStruct should auto-disable and fall back to clean Rails logging
+    env = {
+      "RAILS_ENV" => "production"
+      # Don't set LOGSTRUCT_ENABLED - let auto-detection handle it
+      # Rake tasks should auto-disable because no server is detected
+    }
+
+    # Run a rake task that logs something
+    cmd = ["bundle", "exec", "rake", "logging:test_output"]
+
+    stdout_output = nil
+    stderr_output = nil
+
+    Open3.popen3(env, *cmd, chdir: Rails.root.to_s) do |_stdin, stdout, stderr, wait_thr|
+      begin
+        Timeout.timeout(30) do
+          wait_thr.value
+        end
+      rescue Timeout::Error
+        begin
+          Process.kill("TERM", wait_thr.pid)
+        rescue
+          nil
+        end
+
+        flunk "Rake task timed out"
+      end
+
+      stdout_output = stdout.read
+      stderr_output = stderr.read
+    end
+
+    combined_output = "#{stdout_output}\n#{stderr_output}"
+
+    # Should NOT have hybrid format like: {message: "...", tags: [...]}
+    # This pattern indicates the TaggedLogging monkey patch is wrapping
+    # messages in hashes but they're not going through JSON formatter
+    hybrid_pattern = /\{message:\s*["'].*["'],\s*tags:/
+
+    refute_match hybrid_pattern,
+      combined_output,
+      "Found hybrid log format - LogStruct is half-enabled!\n" \
+      "This means TaggedLogging monkey patch is active but SemanticLogger is not.\n" \
+      "Output:\n#{combined_output}"
+
+    # Should have the exact log messages (not silently dropped)
+    assert_includes combined_output,
+      "Test log message from rake task",
+      "Expected to see 'Test log message from rake task' but logs appear to be dropped.\n" \
+      "Output:\n#{combined_output}"
+
+    # Should have the [custom_tag] prefix in clean Rails format
+    assert_match(/\[custom_tag\].*Tagged test log message/,
+      combined_output,
+      "Expected to see '[custom_tag] Tagged test log message' in clean Rails format.\n" \
+      "Output:\n#{combined_output}")
+  end
+end