Fix TuiChannel integration and enable in main.rs

- Store event_tx in Arc<Mutex<>> so respond() can send to TUI
- Fix run_event_loop to take owned receiver
- Switch main.rs from SimpleCliChannel to TuiChannel
- Add proper terminal cleanup on TUI error

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Cargo.lock

@@ -1047,6 +1047,12 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2acce4a10f12dc2fb14a218589d4f1f62ef011b2d0cc4b3cb1bba8e94da14649"
 
+[[package]]
+name = "fastrand"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
+
 [[package]]
 name = "filetime"
 version = "0.2.27"
@@ -1943,6 +1949,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sha2",
+ "tempfile",
  "testcontainers-modules",
  "thiserror 2.0.18",
  "tokio",
@@ -3286,6 +3293,19 @@ version = "0.12.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "61c41af27dd6d1e27b1b16b489db798443478cef1f06a660c96db617ba5de3b1"
 
+[[package]]
+name = "tempfile"
+version = "3.24.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "655da9c7eb6305c55742045d5a8d2037996d61d8de95806335c7c86ce0f82e9c"
+dependencies = [
+ "fastrand",
+ "getrandom 0.3.4",
+ "once_cell",
+ "rustix 1.1.3",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "termcolor"
 version = "1.4.1"