Add regression test for complex table formatting

tests/data/regression_table_expected.txt

@@ -0,0 +1,8 @@
+| #   | Task                           | Description                                                                                                                                                                                          | Size   | Depends On |
+| --- | ------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------ | ---------- |
+| 3.1 | Graceful Shutdown              | Implement the server-wide graceful shutdown pattern. Use tokio_util::sync::CancellationToken for signalling and tokio_util::task::TaskTracker to ensure all connection actors terminate cleanly.     | Large  | #1.3       |
+| 3.2 | Re-assembly DoS Protection     | Harden the FragmentAdapter by adding a non-optional, configurable timeout for partial message re-assembly and strictly enforcing the max_message_size limit to prevent memory exhaustion.            | Medium | #1.5       |
+| 3.3 | Multiplexed Re-assembly        | Enhance the FragmentAdapter's inbound logic to support concurrent re-assembly of multiple messages. Use the msg_id from FragmentMeta as a key into a dashmap::DashMap of partial messages.           | Large  | #3.2       |
+| 3.4 | Per-Connection Rate Limiting   | Integrate an asynchronous, token-bucket rate limiter into the PushHandle. The rate limit should be configurable on the WireframeApp builder and enforced on every push.                              | Medium | #2.2       |
+| 3.5 | Dead Letter Queue (DLQ)        | Implement the optional Dead Letter Queue mechanism. Allow a user to provide a DLQ channel sender during app setup; failed pushes (due to a full queue) can be routed there instead of being dropped. | Medium | #2.2       |
+| 3.6 | Context-Aware FragmentStrategy | Enhance the FragmentStrategy trait. max_fragment_payload and encode_header should receive a reference to the logical Frame being processed, allowing for more dynamic fragmentation rules.           | Small  | #1.4       |

tests/data/regression_table_input.txt

@@ -0,0 +1,8 @@
+| #   | Task                           | Description                                                                                                                                                                                          | Size   | Depends On |
+| --- | ------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------ | ---------- |
+| 3.1 | Graceful Shutdown              | Implement the server-wide graceful shutdown pattern. Use tokio_util::sync::CancellationToken for signalling and tokio_util::task::TaskTracker to ensure all connection actors terminate cleanly.     | Large  | #1.3       |
+| 3.2 | Re-assembly DoS Protection     | Harden the FragmentAdapter by adding a non-optional, configurable timeout for partial message re-assembly and strictly enforcing the max_message_size limit to prevent memory exhaustion.            | Medium | #1.5       |
+| 3.3 | Multiplexed Re-assembly        | Enhance the FragmentAdapter's inbound logic to support concurrent re-assembly of multiple messages. Use the msg_id from FragmentMeta as a key into a dashmap::DashMap of partial messages.           | Large  | #3.2       |
+| 3.4 | Per-Connection Rate Limiting   | Integrate an asynchronous, token-bucket rate limiter into the PushHandle. The rate limit should be configurable on the WireframeApp builder and enforced on every push.                              | Medium | #2.2       |
+| 3.5 | Dead Letter Queue (DLQ)        | Implement the optional Dead Letter Queue mechanism. Allow a user to provide a DLQ channel sender during app setup; failed pushes (due to a full queue) can be routed there instead of being dropped. | Medium | #2.2       |
+| 3.6 | Context-Aware FragmentStrategy | Enhance the FragmentStrategy trait. max_fragment_payload and encode_header should receive a reference to the logical Frame being processed, allowing for more dynamic fragmentation rules.           | Small  | #1.4       |

tests/integration.rs

@@ -646,3 +646,21 @@ fn test_preserve_hard_line_breaks() {
     assert_eq!(output[0], "Line one with break.");
     assert_eq!(output[1], "Line two follows.");
 }
+
+#[test]
+/// Tests that `process_stream` preserves complex table formatting without modification.
+///
+/// This regression test ensures that properly formatted complex tables with multiple
+/// columns and detailed content pass through the processing pipeline unchanged,
+/// preventing regressions that might inadvertently alter correct formatting.
+fn test_regression_complex_table() {
+    let input: Vec<String> = include_str!("data/regression_table_input.txt")
+        .lines()
+        .map(str::to_string)
+        .collect();
+    let expected: Vec<String> = include_str!("data/regression_table_expected.txt")
+        .lines()
+        .map(str::to_string)
+        .collect();
+    assert_eq!(process_stream(&input), expected);
+}