feat(#84): IMP-84 u1~u3 silent automation policy enforcement (FramePanel reject confirm + slide_base provisional badge/outline + IMP-30 visual assertions inverted)

- u1 FramePanel.tsx: extract `applyFrameSelection(candidate, onFrameSelect)`
  pure helper; collapse `handleFrameSelect` to direct onFrameSelect for every
  V4 label; drop `window.confirm` reject popup (IMP-47B u11 regression noise
  per `feedback_auto_pipeline_first`). New vitest pin `imp84_framepanel_reject_silent.test.ts`
  covers helper invocation across all 4 V4 labels + source-presence pins.
- u2 templates/phase_z2/slide_base.html: delete `.zone--provisional` CSS,
  `.zone__needs-adaptation-badge` CSS, the zone--provisional class fragment
  in the zone div, and the badge `<span>` render at the provisional zone.
  Preserve `data-provisional="1"` attribute as silent telemetry. New pytest
  `tests/phase_z2/test_imp84_provisional_silent_render.py` pins the silent
  contract independently of the IMP-30 first-render file.
- u3 tests/test_phase_z2_imp30_first_render.py: invert the three IMP-30 u5
  positive provisional-visual assertions to IMP-84 silent-contract negatives
  (no class, no badge, no CSS selectors); preserve positive `data-provisional`
  telemetry assertions. Docstrings updated to IMP-84 silent contract.

Out of scope (Round #4 + #92 contract): Home.tsx `toast.error(aiReviewMsg)`
call line, designAgentApi.ts `api_error_kinds`/`api_error_kind` schema and
operational-only formatter, FramePanel reject badge/tooltip read-only labels
(L102/L147/L156), and backend `zone.provisional` flag emission.

Stage 4 PASS: u1 vitest 10/10, u2 pytest 5/5, u3 pytest 29/29 (incl. 3
IMP-84 inverted assertions: `test_imp84_provisional_zone_silent_no_class_no_badge`,
`test_imp84_provisional_badge_never_rendered_in_mixed_zones`,
`test_imp84_slide_base_css_strips_provisional_visual_selectors`).

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

templates/phase_z2/slide_base.html

@@ -114,42 +114,10 @@
       min-height: 0;
     }
 
-    /* ── IMP-30 u5 : provisional zone marker (first-render invariant) ──
-         When V4 rank-1 candidate falls outside MVP1_ALLOWED_STATUSES (chain_exhausted)
-         the pipeline still renders the rank-1 frame so the first-render invariant
-         holds, but the zone is tagged `provisional` so the user/AI can adapt later
-         (IMP-31). Visual contract:
-           - dashed amber border + striped wash → "needs adaptation" at a glance
-           - inline badge top-right → text label for non-color-perceiving readers
-         MDX content is preserved as-is; no shrink, no rewrite. */
-    .zone--provisional {
-      outline: 2px dashed #b8860b;
-      outline-offset: -2px;
-      background-image: repeating-linear-gradient(
-        45deg,
-        rgba(184, 134, 11, 0.04) 0,
-        rgba(184, 134, 11, 0.04) 8px,
-        transparent 8px,
-        transparent 16px
-      );
-    }
-    .zone--provisional .zone__needs-adaptation-badge {
-      position: absolute;
-      top: 4px;
-      right: 4px;
-      z-index: 10;
-      padding: 2px 6px;
-      background: #b8860b;
-      color: #fff;
-      font-size: 9px;
-      font-weight: 700;
-      line-height: 1.2;
-      letter-spacing: 0.04em;
-      border-radius: 2px;
-      text-transform: uppercase;
-      pointer-events: none;
-      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
-    }
+    /* IMP-84: provisional zone visual treatment removed (silent-automation
+       policy). `data-provisional="1"` attribute is still emitted on the
+       zone div as silent telemetry for downstream selectors / inspection;
+       no user-visible outline, wash, or badge. */
 
     /* ── Frame-family text layout contract (shared, reusable) ──
          feedback-1 (mvp1.5b_test7): visible improvement 강화.
@@ -398,8 +366,7 @@
     <div class="slide-body">
       <div class="layout-{{ layout_preset }}">
         {% for zone in zones %}
-        <div class="zone{% if zone.provisional %} zone--provisional{% endif %}" data-zone-position="{{ zone.position }}" data-template-id="{{ zone.template_id }}"{% if zone.provisional %} data-provisional="1"{% endif %}{% if zone.has_popup %} data-has-popup="1"{% endif %} style="grid-area: {{ zone.position }};">
-          {% if zone.provisional %}<span class="zone__needs-adaptation-badge" aria-label="needs user or AI adaptation">needs adaptation</span>{% endif %}
+        <div class="zone" data-zone-position="{{ zone.position }}" data-template-id="{{ zone.template_id }}"{% if zone.provisional %} data-provisional="1"{% endif %}{% if zone.has_popup %} data-has-popup="1"{% endif %} style="grid-area: {{ zone.position }};">
           {{ zone.partial_html | safe }}
           {% if zone.has_popup %}
           {% set _popup_trigger = (zone.popup_binding.detail_trigger if zone.popup_binding else None) or {} %}