feat(evals): ~12-minute blocking paid lanes and a non-blocking marathon lane

- Planner budget mode (--slice-budget S --jobs J): recorded per-tier wall
  times pack into as many ~9-minute executors as the work needs; the plan
  records per-slice estimates and the CI job timeout (supervised worst case
  + 20 min). evals.yml and evals-periodic.yml derive matrix size and
  timeout-minutes from it; max-parallel covers every slice at once.
- Case shards: plan/design/review-army/shared-libs(-paths) run one registered
  case per process (<file>#<case id>, exact name pattern, exactly one case).
- Retry rule: a timed-out attempt is a verdict. Only files whose every case
  budget is CAPTURE tier or shorter keep one retry; walls shrink to match.
- Marathon tier: positive selection, excluded from gate/periodic planners,
  run by the new evals-marathon.yml (weekly + dispatch, fresh, own report).
- PR-lane E2E reuse of verified first-attempt passes on identical inputs;
  the report rejects reuse outside the fast PR profile.
- Duration seed from census run 36385945043, per tier and per case shard.

test/e2e-tier-alignment.test.ts

@@ -184,8 +184,8 @@ describe('E2E tier alignment (touchfiles declaration vs test self-gate)', () =>
       // Both self-gate shapes count: the raw predicate and the consolidated
       // helper (test/helpers/e2e-gate.ts documents this file as a consumer
       // that must recognize describeE2ETier/e2eTierEnabled).
-      const selfGated = /EVALS_TIER\s*===\s*['"](gate|periodic)['"]/.test(content)
-        || /\b(?:describeE2ETier|e2eTierEnabled)\(\s*['"](gate|periodic)['"]/.test(content);
+      const selfGated = /EVALS_TIER\s*===\s*['"](gate|periodic|marathon)['"]/.test(content)
+        || /\b(?:describeE2ETier|e2eTierEnabled)\(\s*['"](gate|periodic|marathon)['"]/.test(content);
       if (!usesNameSelection && selfGated) continue; // fail-open-safe standalone
 
       invisible.push(