ci(evals): attempt-scoped artifacts, verdict-v2 PR comment, weekly pass-rate gate and one INFRA re-dispatch

- Slice, census and marathon artifacts carry -a<run_attempt>; reports
  download them per artifact (no merge), so records never overwrite and a
  re-run never replaces the first attempt's verdict.
- Planners pass --max-parallel for the capacity preflight (24/16 unchanged:
  the refreshed periodic plan needs 24 slices, the gate census 12).
- PR comment: jq-only job reads collector-outcomes v2 (headline, sanitized
  failure block); the group_by(.name)|last recomputation is gone.
- Reports stamp series identities, upload trial-outcomes-* for history, and
  shard logs upload always (a failed trial no longer reds its runner).
- Weekly report: headline + failure block of both lanes in the issue body,
  the eval:pass-rates --gate step (fails closed without history), close the
  issue on a green run, and UC-E1: when every red is machine-classified
  INFRA/INCOMPLETE, one re-dispatch as a new run in its own concurrency
  group (redispatch_of), both runs reported.

.github/workflows/evals-marathon.yml

@@ -187,7 +187,7 @@ jobs:
         if: always()
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
-          name: marathon-slice-${{ matrix.slice }}
+          name: marathon-slice-${{ matrix.slice }}-a${{ github.run_attempt }}
           path: /tmp/marathon-slice-results
           retention-days: 90
 
@@ -209,7 +209,7 @@ jobs:
         if: failure()
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
-          name: marathon-slice-${{ matrix.slice }}-logs
+          name: marathon-logs-slice-${{ matrix.slice }}-a${{ github.run_attempt }}
           include-hidden-files: true
           # The Fix-bun-temp step points TMPDIR at /home/runner/.cache, so the
           # runner's spool lands THERE, not /tmp — the original /tmp glob
@@ -247,9 +247,8 @@ jobs:
 
       - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
-          pattern: marathon-slice-[0-9]*
+          pattern: marathon-slice-*
           path: /tmp/marathon-report
-          merge-multiple: true
 
       - name: Reconcile slices against the manifest (fail-closed)
         id: reconcile