add Eurostat + UK ONS sources; valuation/bubble/economy/bonds groups; aggregate read; market-open header

Three new data sources hooked into the existing SOURCES registry. All
open APIs, no keys:

  - EUROSTAT: prefix EUROSTAT:dataset?dim=val&... — current EU bond
    yields (Bund/OAT/BTP/EZ) and Eurozone economic indicators that
    FRED's OECD-mirror series stopped updating in 2022-2023.
  - ONS: prefix ONS:topic/cdid/dataset — current UK CPI, unemployment,
    GDP, industrial production. Replaces the 5+ month-stale FRED
    LRHUTTTTGBM156S mirror.

New indicator groups in default.toml feed the strategic/fundamental
lens we converged on: valuation (CAPE/Buffett anchors), bubble_watch
(SKEW/VVIX/RSP vs SPY/HYG vs TLT/IPO/crypto), economy (multi-region,
ALL current-or-stale-flagged), bonds (UK/EU/US/JPN sovereign yields).

Indicator panel now opens with an AI "read" interpretation per group
(generated hourly at :07 UTC alongside an aggregate cross-group read
shown in the dashboard header). The aggregate is grounded by a markets
strip — NYSE/LSE/Frankfurt/Tokyo/HK/Shanghai with open/closed LEDs and
next-open countdown, computed locally from each exchange's tz.

Other UX bits: indicator-row tooltips populated from TOML notes;
rows whose last observation is >90 days old get a 'stale' chip;
ghost symbols (in DB but no longer in TOML) filtered out of the
panel; Eurostat/ONS symbols display as short codes rather than the
full API path.

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

app/templates/dashboard.html

@@ -2,6 +2,14 @@
 {% block title %}Cassandra · Dashboard{% endblock %}
 
 {% block main %}
+<div id="dash-header-container"
+     style="grid-column: 1 / -1;"
+     hx-get="/api/summary/aggregate?as=html"
+     hx-trigger="load, every 300s"
+     hx-swap="innerHTML">
+  <div class="empty">loading aggregate read…</div>
+</div>
+
 <section id="indicators-panel" class="panel">
   <div class="panel-header">
     <span class="title">Indicators</span>

app/templates/partials/dashboard_header.html

@@ -0,0 +1,32 @@
+<div class="dash-header">
+  <div class="dash-header__markets">
+    {% for m in markets %}
+      <div class="mkt {% if m.open %}mkt--open{% else %}mkt--closed{% endif %}">
+        <span class="mkt__dot"></span>
+        <span class="mkt__name">{{ m.name }}</span>
+        <span class="mkt__state">{{ m.label }}</span>
+        <span class="mkt__when">
+          <span class="mkt__when-label">{% if m.open %}closes{% else %}opens{% endif %}</span>
+          <time datetime="{{ m.until.isoformat() }}" title="{{ m.until.isoformat() }}">{{ m.until.strftime("%H:%MZ") }}</time>
+        </span>
+      </div>
+    {% endfor %}
+  </div>
+
+  {% if summary %}
+  <div class="dash-header__read">
+    <div class="dash-header__read-meta">
+      <span class="ind-summary__label">aggregate read</span>
+      <span class="ind-summary__when" title="generated {{ summary.generated_at }}">
+        {{ summary.generated_at.strftime("%H:%M UTC") }}
+      </span>
+    </div>
+    <p class="dash-header__read-body">{{ summary.content }}</p>
+  </div>
+  {% else %}
+  <div class="dash-header__read dash-header__read--pending">
+    <span class="ind-summary__label">aggregate read</span>
+    <span class="dash-header__read-body">pending — generated hourly @ :07 UTC</span>
+  </div>
+  {% endif %}
+</div>

app/templates/partials/indicators.html

@@ -1,3 +1,19 @@
+{% if summary %}
+<div class="ind-summary">
+  <div class="ind-summary__head">
+    <span class="ind-summary__label">read</span>
+    <span class="ind-summary__when" title="generated {{ summary.generated_at }}">
+      {{ summary.generated_at.strftime("%H:%M UTC") }}
+    </span>
+  </div>
+  <p class="ind-summary__body">{{ summary.content }}</p>
+</div>
+{% else %}
+<div class="ind-summary ind-summary--pending">
+  <span class="ind-summary__label">read</span>
+  <span class="ind-summary__body">summary pending — generated hourly @ :07 UTC</span>
+</div>
+{% endif %}
 {% if not quotes %}
 <div class="empty">no data yet — scheduler may not have run</div>
 {% else %}
@@ -13,9 +29,19 @@
   </thead>
   <tbody>
   {% for q in quotes %}
-    <tr>
-      <td class="label">{{ q.symbol }}</td>
-      <td>{{ q.label or "" }}</td>
+    {% set is_stale = stale_symbols and q.symbol in stale_symbols %}
+    <tr class="{% if is_stale %}row-stale{% endif %}">
+      {% set tip = notes.get(q.symbol, '') if notes else '' %}
+      {# Long Eurostat ('dataset?...') and ONS ('topic/.../cdid/dataset') symbols
+         get truncated for display; hover shows the full identifier via title.
+         Other symbols pass through. #}
+      {% set short_sym = q.symbol %}
+      {% if '?' in short_sym %}{% set short_sym = short_sym.split('?')[0] %}{% endif %}
+      {% if '/' in short_sym %}{% set short_sym = short_sym.split('/')[-2] | upper %}{% endif %}
+      <td class="label has-tip" title="{{ q.symbol }}{% if tip %} — {{ tip }}{% endif %}">
+        {{ short_sym }}{% if is_stale %} <span class="stale-tag" title="last observation older than 90 days">stale</span>{% endif %}
+      </td>
+      <td {% if tip %}title="{{ tip }}"{% endif %}>{{ q.label or "" }}</td>
       <td class="num">{{ q.price | price }}</td>
       <td class="neu">{{ q.currency or "" }}</td>
       {% for k in ["1d","1m","1y"] %}