IMP-05 deterministic V4 candidate bridge — pre-render rank-2/3 fallback + trace schema + dedup invariant test

round 55~73 review-loop lock per Codex #11 final + Claude #13 6-axis L1~L9.

Scope (deterministic only) :
- pre-render rank-2/3 fallback via lookup_v4_match_with_fallback (selector only,
  no calculate_fit migration, no AI, no full planner rerun, no layout topology change,
  no abort behavior change)
- Step 9 informative candidate_evidence schema (additive) — v4_label / phase_z_status
  / catalog_registered / filtered_for_direct_execution / route_hint / decision / reason
- Step 20 qualifier fields (additive) — fallback_used / fallback_selection_count
  / selection_paths[] — top-level enum unchanged
- restructure / reject candidates preserved as non-direct evidence with route hints
  (design_reference_only / ai_adaptation_required) — deferred actual handlers IMP-29/IMP-31
- catalog 1:1 invariant test (separate file tests/test_catalog_invariant.py) —
  fails fast if template_id/frame_id 1:1 mapping ever breaks
- 6 behavior tests fully synthetic with MOCK_ prefix (no real catalog IDs,
  no v4_full32_result.yaml dependency) — monkeypatch get_contract +
  compute_capacity_fit (selector has no DI, function signature unchanged)

Deferred to follow-up issues :
- IMP-30 first-render invariant + abort bypass (zero-unit + section status filter)
- IMP-29 frontend zone-level override (deterministic only)
- IMP-31 AI-assisted frame-aware adaptation

Guardrails locked : no calculate_fit / no AI / no frontend / no full rerun /
no layout topology / no abort behavior change / no 1-2 sample hardcoding.

Tests : 8/8 pass (6 selector behavior + 2 catalog invariant).
Smoke regression : 11/11 partials pass (IMP-04 F17 calibration intact).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/phase_z2_router.py

@@ -62,7 +62,7 @@ ACTION_IMPLEMENTATION_STATUS: dict[str, str] = {
     "zone_ratio_retry":          "IMPLEMENTED",  # A3 (2026-04-29) phase_z2_retry.plan_zone_ratio_retry + pipeline orchestration
     "layout_adjust":             "MISSING",
     "details_popup_escalation":  "MISSING",      # CLAUDE.md 의 <details> 원칙은 있음, runtime 미구현
-    "frame_reselect":            "MISSING",      # V4 top-k 자료는 있음, planner 가 rank-1 만
+    "frame_reselect":            "PARTIAL",      # IMP-05 pre-render rank-2/3 fallback implemented; post-render rerender trace-only
     "adapter_needed":            "PARTIAL",      # composition v0.1.1 의 mapper FitError catch
     "abort":                     "IMPLEMENTED",  # sys.exit(1) — pipeline 의 현재 default
 }