Add domain CRUD, energy density constraint, LLM status, reset results, score display fixes

Domain management:
- Add domain list/detail/form templates and full CRUD routes (domains.py)
- Add metric bound add/edit/delete via HTMX partials (_metrics_table.html)

Energy density constraint (Rule 6 in ConstraintResolver):
- Hard-block combos where power source provides <25% of platform's required Wh/kg
- Warn (conditional) when under-density but within 4x
- Solar Sail exempt (no stored energy); Airplane requires 400 Wh/kg, Spaceship 2000 Wh/kg
- Add energy_density_wh_kg provides to all 8 stored-energy power sources in seed data
- 3 new constraint resolver tests

LLM-complete status:
- Pipeline Pass 4 now sets combo status to llm_reviewed after successful LLM review
- update_combination_status guards against downgrading: scored won't overwrite
  llm_reviewed or reviewed; llm_reviewed won't overwrite reviewed
- Add badge-llm_reviewed CSS style (light blue)

Reset results:
- Repository.reset_domain_results() deletes combination_results, combination_scores,
  and pipeline_runs for a domain; pipeline re-evaluates on next run
- POST /results/<domain>/reset route with flash confirmation
- "Reset results" danger button with JS confirm dialog in results list

Fix composite score 0 displaying as --- (Jinja2 falsy 0.0 bug):
- Change `if r.composite_score` to `if r.composite_score is not none`

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/physcom_web/templates/domains/_metrics_table.html

@@ -0,0 +1,68 @@
+<table id="metrics-table">
+  <thead>
+    <tr>
+      <th>Metric</th>
+      <th>Unit</th>
+      <th>Weight</th>
+      <th>Norm Min</th>
+      <th>Norm Max</th>
+      <th></th>
+    </tr>
+  </thead>
+  <tbody>
+    {% for mb in domain.metric_bounds %}
+    <tr>
+      <td>{{ mb.metric_name }}</td>
+      <td>{{ mb.unit or '—' }}</td>
+      <td>{{ mb.weight }}</td>
+      <td>{{ mb.norm_min }}</td>
+      <td>{{ mb.norm_max }}</td>
+      <td class="actions">
+        <button class="btn btn-sm"
+                onclick="this.closest('tr').nextElementSibling.style.display='table-row'; this.closest('tr').style.display='none'">
+          Edit
+        </button>
+        <form method="post"
+              hx-post="{{ url_for('domains.metric_delete', domain_id=domain.id, metric_id=mb.metric_id) }}"
+              hx-target="#metrics-section" hx-swap="innerHTML"
+              class="inline-form">
+          <button type="submit" class="btn btn-sm btn-danger">Del</button>
+        </form>
+      </td>
+    </tr>
+    <tr class="edit-row" style="display:none">
+      <form method="post"
+            hx-post="{{ url_for('domains.metric_edit', domain_id=domain.id, metric_id=mb.metric_id) }}"
+            hx-target="#metrics-section" hx-swap="innerHTML">
+        <td>{{ mb.metric_name }}</td>
+        <td><input name="unit" value="{{ mb.unit or '' }}"></td>
+        <td><input name="weight" type="number" step="any" value="{{ mb.weight }}" required></td>
+        <td><input name="norm_min" type="number" step="any" value="{{ mb.norm_min }}" required></td>
+        <td><input name="norm_max" type="number" step="any" value="{{ mb.norm_max }}" required></td>
+        <td>
+          <button type="submit" class="btn btn-sm btn-primary">Save</button>
+          <button type="button" class="btn btn-sm"
+                  onclick="this.closest('tr').style.display='none'; this.closest('tr').previousElementSibling.style.display=''">
+            Cancel
+          </button>
+        </td>
+      </form>
+    </tr>
+    {% endfor %}
+  </tbody>
+</table>
+
+<h3>Add Metric</h3>
+<form method="post"
+      hx-post="{{ url_for('domains.metric_add', domain_id=domain.id) }}"
+      hx-target="#metrics-section" hx-swap="innerHTML"
+      class="dep-add-form">
+  <div class="form-row">
+    <input name="metric_name" placeholder="metric name" required>
+    <input name="unit" placeholder="unit">
+    <input name="weight" type="number" step="any" placeholder="weight" value="1.0" required>
+    <input name="norm_min" type="number" step="any" placeholder="norm min" value="0.0" required>
+    <input name="norm_max" type="number" step="any" placeholder="norm max" value="1.0" required>
+    <button type="submit" class="btn btn-primary">Add</button>
+  </div>
+</form>