fix: resolve 14 test failures across 3 test files

ProcessContentTaskTest: set mock properties directly instead of
shouldReceive('__get') which doesn't reliably intercept property
access on Mockery mocks of non-existent classes.

HasStreamParsing: fix parseJSONStream chunked read bug where the
inner parse loop restarted at position 0 with stale state from
a previous partial parse. Track scan position across chunks.

AgentDetection: fix Postman regex \bPostman\b → \bPostman/ so it
matches PostmanRuntime (no word boundary between n and R).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Services/AgentDetection.php

@@ -131,7 +131,7 @@ class AgentDetection
         '/\bwget\b/i',
         '/\bpython-requests\b/i',
         '/\bgo-http-client\b/i',
-        '/\bPostman\b/i',
+        '/\bPostman/i',
         '/\bInsomnia\b/i',
         '/\baxios\b/i',
         '/\bnode-fetch\b/i',

Services/Concerns/HasStreamParsing.php

@@ -119,6 +119,7 @@ trait HasStreamParsing
         $inString = false;
         $escape = false;
         $objectStart = -1;
+        $scanPos = 0;
 
         while (! $stream->eof()) {
             $chunk = $stream->read(8192);
@@ -129,9 +130,10 @@ trait HasStreamParsing
 
             $buffer .= $chunk;
 
-            // Parse JSON objects from the buffer
+            // Parse JSON objects from the buffer, continuing from where
+            // the previous iteration left off to preserve parser state.
             $length = strlen($buffer);
-            $i = 0;
+            $i = $scanPos;
 
             while ($i < $length) {
                 $char = $buffer[$i];
@@ -176,6 +178,7 @@ trait HasStreamParsing
                             $buffer = substr($buffer, $i + 1);
                             $length = strlen($buffer);
                             $i = -1; // Will be incremented to 0
+                            $scanPos = 0;
                             $objectStart = -1;
                         }
                     }
@@ -183,6 +186,9 @@ trait HasStreamParsing
 
                 $i++;
             }
+
+            // Save scan position so we resume from here on the next chunk
+            $scanPos = $i;
         }
     }
 }

tests/Unit/ProcessContentTaskTest.php

@@ -33,9 +33,12 @@ function makeTask(array $attributes = []): ContentTask
     $task->shouldReceive('markCompleted')->byDefault();
     $task->shouldReceive('markFailed')->byDefault();
 
-    $task->shouldReceive('__get')->andReturnUsing(function (string $prop) use ($attributes) {
-        return $attributes[$prop] ?? null;
-    })->byDefault();
+    // Set properties directly on the mock — Mockery handles __get/__set
+    // internally. Using shouldReceive('__get') doesn't reliably intercept
+    // property access on mocks of non-existent classes.
+    foreach ($attributes as $key => $value) {
+        $task->{$key} = $value;
+    }
 
     return $task;
 }