Synced from monorepo

Changes:
- Detect the herdr multiplexer
- Mark /gboom as non-production code
- Bound peak memory when loading a large session
- Add a subagent lifecycle soak bounding threads, fds, and heap
- Stream inherited replay to bound fork memory
- Copy full plan from plan approval with y
- Stop armed signature verification from deleting the managed-deny smoke policy
- Add source-tagged terminal version telemetry
- Show the UI instantly and fetch models and settings in the background
- Session test helpers
- computer_reason on the ConversationHistoryDone trailer

crates/codegen/xai-grok-shell/Cargo.toml

@@ -8,7 +8,11 @@ edition.workspace = true
 default = []
 unstable = []
 dhat-heap = ["dep:dhat"]
-default-bazel = []
+# Session synthesis + in-process e2e harness (`session::testkit`) for soak,
+# load, and bench tests. Off by default; the tests/benches that use it declare
+# it via `required-features`.
+test-support = []
+default-bazel = ["test-support"]
 
 [dependencies]
 dunce = { workspace = true }
@@ -215,6 +219,24 @@ harness = false
 [[bench]]
 name = "fork_copy"
 harness = false
+required-features = ["test-support"]
+
+# Consume `session::testkit`, so they need the gate (on by default under Bazel).
+[[test]]
+name = "test_session_load_memory"
+required-features = ["test-support"]
+
+[[test]]
+name = "session_fork_replay_memory"
+required-features = ["test-support"]
+
+[[test]]
+name = "session_load_perf"
+required-features = ["test-support"]
+
+[[test]]
+name = "testkit_synth_roundtrip"
+required-features = ["test-support"]
 
 [lints]
 workspace = true