Add 10-minute timeout to test commands and disable e2e in merge pipeline

Test commands in run_project_tests now use wait-timeout to enforce a
600-second ceiling, preventing hung processes (e.g. Playwright with no
server) from blocking the merge pipeline indefinitely. Also disables
e2e tests in script/test until the merge workspace can run them safely.

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

Cargo.lock

@@ -4028,6 +4028,7 @@ dependencies = [
  "tokio-tungstenite 0.28.0",
  "toml 1.0.6+spec-1.1.0",
  "uuid",
+ "wait-timeout",
  "walkdir",
 ]
 
@@ -4771,6 +4772,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "wait-timeout"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ac3b126d3914f9849036f826e054cbabdc8519970b8998ddaf3b5bd3c65f11"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "walkdir"
 version = "2.5.0"