[CI] Run downstream tests on upstream layer changes

Expand paths-filter in fray, zephyr, levanter, and marin workflows to
include all upstream layers each project imports from. Previously, an
iris change could break fray tests without CI noticing until the next
fray-touching PR (concrete case: cf05d94 broke 5 assertions for two days).

Fixes #4728

Author: rjpower

.github/workflows/fray-unit-tests.yaml

@@ -25,6 +25,8 @@ jobs:
           filters: |
             relevant:
               - 'lib/fray/**'
+              # fray imports from iris; run fray tests on any iris change so cross-layer breakage is caught here.
+              - 'lib/iris/**'
               - 'uv.lock'
               - '.github/workflows/fray-unit-tests.yaml'
 

.github/workflows/levanter-tests.yaml

@@ -27,6 +27,10 @@ jobs:
             relevant:
               - 'lib/levanter/**'
               - 'lib/haliax/**'
+              # levanter depends on upstream layers (haliax, fray, zephyr, transitively iris).
+              - 'lib/iris/**'
+              - 'lib/fray/**'
+              - 'lib/zephyr/**'
               - 'uv.lock'
               - '.github/workflows/levanter-tests.yaml'
 

.github/workflows/marin-unit-tests.yaml

@@ -28,6 +28,12 @@ jobs:
               - 'lib/marin/**'
               - 'experiments/grug/**'
               - 'tests/**'
+              # marin sits at the top of the dependency stack; run on any upstream layer change.
+              - 'lib/haliax/**'
+              - 'lib/iris/**'
+              - 'lib/fray/**'
+              - 'lib/zephyr/**'
+              - 'lib/levanter/**'
               - 'uv.lock'
               - 'pyproject.toml'
               - '.github/workflows/marin-unit-tests.yaml'

.github/workflows/zephyr-unit-tests.yaml

@@ -25,8 +25,9 @@ jobs:
           filters: |
             relevant:
               - 'lib/zephyr/**'
-              # Iris is being actively developed, to avoid bugs sneaking into zephyr, we trigger zephyr tests on iris change
+              # zephyr depends on iris and fray; run zephyr tests on any upstream change.
               - 'lib/iris/**'
+              - 'lib/fray/**'
               - 'uv.lock'
               - '.github/workflows/zephyr-unit-tests.yaml'