docs: refresh dashboard screenshot with live MacBook v0.5.1 data (#60)

D82 originally rendered docs/img/dashboard-v0.5.0.png from synthetic
quota_v2 data (the live API wasn't probed at the time of capture).
After v0.5.1 hotfix shipped, the screenshot is replaced with a render
from a real /v0/management/dashboard-data response captured 2026-05-27
from the MacBook OLP server on commit fa2d1af (F4+#7 post-merge).

Changes:
- docs/img/dashboard-v0.5.0.png → docs/img/dashboard-v0.5.1.png
  (rename + content refresh; new content is the v0.5.1 live capture)
- README.md screenshot reference updated to v0.5.1 path + alt-text
  now includes the live utilization numbers (5h: 6%, 7d: 38%)
- docs/exit-gates/phase-5-e2e.json refreshed to reflect the post-v0.5.1
  test (different server version, different temp owner key, new
  utilization snapshot). Records the v0.5.1 contract verifications
  (status enum, failure null for healthy live, schema_version match).

Post-test cleanup verified:
- Temp owner key (id=0m6s2s97, name=v0.5.1-screenshot) revoked
- ~/.olp/config.json providers.anthropic.quota_probe_enabled flag
  removed (config restored to baseline)
- Test server (port 14567) terminated

No code or contract changes. Pure documentation refresh.

Co-authored-by: dtzp555 <dtzp555@gmail.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

docs/exit-gates/phase-5-e2e.json

@@ -1,72 +1,34 @@
 {
-  "phase": "Phase 5",
-  "exit_gate_item": "9 \u2014 Live MacBook E2E verification (dashboard renders enriched panel with real quota data)",
-  "captured_at_utc": "2026-05-26T07:56:36.651Z",
+  "phase": "v0.5.1 post-release",
+  "purpose": "Refresh dashboard screenshot with live MacBook data after v0.5.1 hotfix (replacing D82's synthetic-data render)",
+  "captured_at_utc": "2026-05-27T01:26:17.304Z",
   "host": "maintainer's MacBook (Mac client test target per project test-envs; specific IP / Tailscale node redacted per public-repo hygiene)",
-  "server_version": "0.4.4 (pre-v0.5.0-close; main @ commit 2b07a3b \u2014 D83)",
+  "server_version": "0.5.1 (main @ commit fa2d1af \u2014 F4+#7 post-merge)",
   "olp_port": 14567,
   "endpoint_tested": "/v0/management/dashboard-data",
   "auth": "owner-tier OLP key (temp, revoked post-test)",
-  "config_opt_in": {
-    "providers.anthropic.quota_probe_enabled": true
-  },
-  "quota_v2_shape_proof": [
-    {
-      "provider": "anthropic",
-      "status": "live",
-      "schema_version": "2026-05-26",
-      "last_fresh_at": 1779782166101,
-      "utilization": {
-        "5h": 0.36,
-        "7d": 0.34
-      },
-      "reset": {
-        "5h": 1779794400,
-        "7d": 1780225200,
-        "overall": 1779794400,
-        "overage": null
-      },
-      "representative_claim": "five_hour",
-      "fallback_percentage": 0.5,
-      "overage": {
-        "status": "rejected",
-        "disabled_reason": "org_level_disabled_until"
-      },
-      "raw_available": true
-    },
-    {
-      "provider": "openai",
-      "status": "unavailable",
-      "reason": "no public quota api or probe disabled",
-      "schema_version": null,
-      "last_fresh_at": null,
-      "utilization": null,
-      "reset": null,
-      "representative_claim": null,
-      "fallback_percentage": null,
-      "overage": null,
-      "raw_available": false
-    }
-  ],
   "result_summary": {
     "anthropic": {
       "status": "live",
       "schema_version": "2026-05-26",
-      "utilization_5h": 0.36,
-      "utilization_7d": 0.34,
+      "utilization_5h": 0.06,
+      "utilization_7d": 0.38,
       "representative_claim": "five_hour",
-      "overage_status": "rejected",
-      "fallback_percentage": 0.5
+      "failure": null
     },
     "openai": {
       "status": "unavailable",
       "reason": "no public quota api or probe disabled"
     }
   },
-  "dashboard_screenshot": "docs/img/dashboard-v0.5.0.png",
+  "v0_5_1_contract_verified": [
+    "quota_v2[i].status enum includes 'live' (anthropic) and 'unavailable' (openai) \u2014 both rendered correctly",
+    "quota_v2[i].failure is null for healthy live status (per ADR 0013 Rule 6 \u2014 failure info only on stale/unreachable)",
+    "quota_v2[i].schema_version pinned at 2026-05-26 \u2014 matches models-registry.json quota_probe.schema_version"
+  ],
   "post_test_cleanup": [
-    "temp owner key (id=6yullsd-, name=e2e-d83-close-prep) revoked",
+    "temp owner key (id=0m6s2s97, name=v0.5.1-screenshot) revoked",
     "~/.olp/config.json providers.anthropic.quota_probe_enabled flag removed (config restored to baseline)",
-    "test server (pid=36163, port=14567) terminated"
+    "test server (pid varies, port=14567) terminated"
   ]
 }