test(IMP-04): add F14 render artifact check and fix min-height note

3rd commit in F14 series (calibration point clean pass). Closes the two
Codex round 26 (#15435) blockers:
1. min_height_px self-contradiction
2. F14 actual rendered visual artifact absent

Per Codex round 28 (#15447) agreement (M1 + --render-to extension) and
Claude round 27 (#15438) fix path :

Changes :

1. templates/phase_z2/catalog/frame_contracts.yaml — min_height_px 320 → 350.
   Comment now self-consistent : 70 (badge raster) + 210 (bullet body) +
   36 (photo strip) + 30 (padding) = 346 sum + 4 safety buffer = 350.
   F14 is now F29-class (345) per raster-promoted content density.

2. scripts/smoke_frame_render.py — add `--render-to DIR` dev mode (R3
   acceptance gate). Behavior :
   - StrictUndefined smoke render (unchanged)
   - reuse production `copy_assets(template_id, run_dir)` so the runtime
     asset delivery path is exercised (no logic duplication)
   - wrap partial with minimal viewer HTML (Phase Z token vars + slide-
     sized wrap, browser-openable)
   - fail-fast if rendered HTML references a missing local asset (per
     Codex round 28 §4 recommendation)
   - save artifact to {DIR}/index.html with {DIR}/assets/{template_id}/*
   - production render path (phase_z2_pipeline.render_slide) unchanged
   - small regex fix : asset extraction now captures both `src="..."`
     and `url("...")` references

F14 verification (3rd commit) :
- python -m py_compile scripts/smoke_frame_render.py : PASS
- python scripts/smoke_frame_render.py --self-check : PASS 4/4 (7446 chars
  for persona unchanged from a1c06b7)
- python scripts/smoke_frame_render.py three_persona_benefits --render-to
  data/runs/imp04_f14_visual : PASS, 10 asset refs all resolved, 14
  raster files copied via production copy_assets() to
  data/runs/imp04_f14_visual/assets/three_persona_benefits/
- R3 artifact ready for browser visual inspection at
  data/runs/imp04_f14_visual/index.html (Phase Z slide-sized wrapper +
  promoted persona partial + 10 referenced assets all on disk)

F14 clean pass status :
- min_height_px self-consistency : fixed (M1 = 350)
- Actual rendered artifact : produced and assets resolved
- Visual fidelity inspection : ready for browser/eye review
- Earlier MDX02 chain attempt (commit a1c06b7 body) : superseded;
  MDX02 is not the F14 validation baseline (Claude round 26 / Codex
  round 26 agreement). MDX03 is the matched baseline; F14 visual
  inspection now uses the harness artifact path instead.

scope-lock guardrails honored : 32-frame target, no V4 logic change,
no Phase R' regression, no mapper or composition planner change, no
production render path change. The new harness mode is dev verification
only, isolated from runtime selection.

Refs Gitea #4 (IMP-04 Track A — F14 3rd commit, clean pass gate)

templates/phase_z2/catalog/frame_contracts.yaml

@@ -206,13 +206,16 @@ three_persona_benefits:
     - constructor
     - designer
 
-  # min_height_px : derive + confirm (Codex round 13 §2.2 + round 24 asset 분류).
+  # min_height_px : derive + confirm (Codex round 13 §2.2 + round 24 asset 분류
+  # + round 26 self-consistency catch + round 28 M1 결정).
   # Figma frame 1927 px @ scale 0.49213 → 948 px adapted (full frame).
   # Phase Z slide-body ≤ 585 px → adaptive content fit.
-  # Content density 2nd refinement : badge raster 70 + bullet body ~210 + photo strip 36 + padding 30
-  # = 346 (F29 class). 안전 buffer 포함 = **320**. confirm via V2 MDX 02 validation.
+  # Content density 2nd refinement (raster promoted) :
+  #   badge raster 70 + bullet body 210 + photo strip 36 + padding 30 = 346 sum
+  #   + 4 safety buffer = **350** (F29 345 와 동등 class).
+  # confirm via smoke harness `--render-to` artifact (browser visual inspection).
   visual_hints:
-    min_height_px: 320
+    min_height_px: 350
 
   accepted_content_types:
     - text_block