ci(workspace): bump core-and-rest timeout 150→180min (iter 231)

iter-230's exclusion of the 4 hailo crates from the catch-all
shard was necessary but not sufficient. Historical successful
runs of `Tests (core-and-rest)` landed at 2h 30m 16s — exactly at
the old 150min cap with no headroom. Two PR-413 runs (iter 228 on
9db4499a7, iter 230 on a58bdd061) both got cancelled mid-test
when the shard's natural runtime drifted past the cap.

Bumping to 180min gives ~30min headroom on the typical run. If a
future regression pushes the shard past 180min we should split
crates out into a sibling shard (the way ml-research-heavy and
core-and-rest-heavy were carved out at iters 122/128) rather than
keep raising this cap.

Same iter-pattern as iter-228 + iter-229 + iter-230: each
iter-219 workspace-rejoin side effect surfaces under a different
CI matrix configuration and gets fixed in turn.

Failing job:
  Tests (core-and-rest) on PR #413 (a58bdd061):
    completed cancelled — 150min cap hit at step #7
  Tests (core-and-rest) on PR #413 (9db4499a7):
    completed cancelled — same cap

Co-Authored-By: claude-flow <ruv@ruv.net>

.github/workflows/ci.yml

@@ -79,7 +79,15 @@ jobs:
     # `core-and-rest` is the catch-all shard and compiles ~50 crates; on a
     # cold cache the build alone has hit ~90min, so headroom matters more
     # than tight feedback for this job. Faster shards still finish in ~10–20m.
-    timeout-minutes: 150
+    # Iter 231 — bumped 150→180. Historical successful runs landed at
+    # 2h 30m 16s (just under the old cap); two PR-413 runs (iter 228 +
+    # iter 230) both hit the cap and got cancelled mid-test. Excluding
+    # the iter-219 hailo crates from the catch-all (iter 230) was a
+    # necessary but not sufficient fix — the shard was already at the
+    # ragged edge. 180min gives ~30min headroom on the typical 150min
+    # run; if a shard's natural duration drifts further we should split
+    # crates out into a new sibling shard rather than push this higher.
+    timeout-minutes: 180
     strategy:
       fail-fast: false
       matrix: