[CI] (Disaggregated): P7's packed-float mip gate flips to green, by name

5310ff62 generates the R11F_G11F_B10F chain with a real GPU shader blit and gives
F1WireScenario.GenerateMipmapPackedFloatPixels pixel assertions, so the entry now
passes under strict split state and `Magma:mipmap-native-format@P7` survives in no
source file. The old arm would therefore have failed its own `test rc -ne 0`.

Both halves of the arm are retired in one commit, because either alone is a lie:
CMakeLists' fm loop drops the special case that gave this slot the
`integration-magma-p7-known-red` label, so the entry is discovered by the ordinary
`integration-magma-split` lane - the same label, environment and pixels assertion
as GenerateMipmapPixels and GenerateMipmapDepthPixels next to it, and the same
label the dual-block census lane already re-runs.

The lane membership alone would not be the old gate's equal: a lane counts its
entries' exit codes, not their absence. So the CI step keeps its shape and inverts
its expectation - the same single named entry, discovered and run by name under
MOBILEGL_IPC_STRICT_ERRORS=1 and MOBILEGL_IPC_ROLE_SPLIT_STATE=1, now asserted
through split_log_paths.py's require_green, which rejects a skip, a missing entry
and a failure alike. No assertion is skipped away or weakened: the pixels are
checked by the test, and the named-refusal check the log carried is what the GPU
blit retired.

.github/workflows/test.yml

@@ -1638,7 +1638,12 @@ jobs:
             ${{ runner.temp }}/magma-cache-syncval
           if-no-files-found: ignore
 
-      - name: Magma P7 native mip format debt stays a named refusal
+      # The packed-float chain is generated by a real GPU shader blit, so this entry sits in the
+      # integration-magma-split lane with its siblings (CMakeLists.txt's fm loop) and carries
+      # their pixels assertion. Its named check survives the flip in the only direction that has
+      # evidence behind it: the case must EXECUTE, PASS, and never skip - a lane-level exit code
+      # alone would not separate "generated" from "quietly absent".
+      - name: Magma P7 packed-float mip generation executes green under strict split state
         working-directory: build-split
         env:
           MOBILEGL_ITEST_REQUIRE_GPU: "1"
@@ -1646,21 +1651,17 @@ jobs:
           MOBILEGL_IPC_ROLE_SPLIT_STATE: "1"
           MOBILEGL_TRANSPORT: "inproc"
         run: |
-          private_log=MobileGL/MG_IntegrationTest/p5f-fm-GenerateMipmapPackedFloatPixels.log
-          rm -f "${private_log}"
-          rc=0
-          ctest -L integration-magma-p7-known-red --no-tests=error --output-on-failure \
-            --output-junit "${RUNNER_TEMP}/magma-p7.xml" || rc=$?
-          test "${rc}" -ne 0
-          python3 - "${RUNNER_TEMP}/magma-p7.xml" "${private_log}" <<'PY'
-          import pathlib, sys, xml.etree.ElementTree as ET
-          cases = list(ET.parse(sys.argv[1]).getroot().iter("testcase"))
-          assert len(cases) == 1, "the P7 probe must execute exactly one named case"
-          case = cases[0]
-          assert case.get("name", "").endswith("GenerateMipmapPackedFloatPixels"), case.attrib
-          assert case.find("skipped") is None and case.find("failure") is not None, "the P7 probe must fail, never skip"
-          log = pathlib.Path(sys.argv[2]).read_text()
-          assert 'Fatal{UnmigratedVerb, "Magma:mipmap-native-format@P7"}' in log, "missing named native-format refusal"
+          p7_case='^DirectVulkan\.Split\.Fm\.F1WireScenario\.GenerateMipmapPackedFloatPixels$'
+          ctest -R "${p7_case}" --show-only=json-v1 > "${RUNNER_TEMP}/magma-p7-lane.json"
+          ctest -R "${p7_case}" --no-tests=error --output-on-failure \
+            --output-junit "${RUNNER_TEMP}/magma-p7.xml"
+          python3 - "${GITHUB_WORKSPACE}/MobileGL/MG_IntegrationTest/Harness/split_log_paths.py" \
+            "${RUNNER_TEMP}/magma-p7-lane.json" "${RUNNER_TEMP}/magma-p7.xml" <<'PY'
+          import importlib.util, json, sys
+          spec = importlib.util.spec_from_file_location("slp", sys.argv[1])
+          slp = importlib.util.module_from_spec(spec); spec.loader.exec_module(slp)
+          name = "DirectVulkan.Split.Fm.F1WireScenario.GenerateMipmapPackedFloatPixels"
+          slp.require_green(json.load(open(sys.argv[2])), sys.argv[3], [name])
           PY
 
       # Client vertex/index inputs are copied into owned wire buffer resources.