feat(heatmap): expose technique name + real status on every layer

The Coverage Matrix heatmap only ever showed the bare MITRE ID on each
cell (name only via hover tooltip), and colored cells from a continuous
score -> hex gradient with no discrete status concept — unlike the
Techniques page, which showed ID+name inline with a fixed 5-color status
palette. Unifying the two pages' visual style requires both pieces of
data to exist server-side.

- Adds "name" to all 4 layer builders (coverage/threat-actor/detection-
  rules/campaign) — harmless extra field for Navigator exports, lets the
  frontend show it inline.
- Adds "status" (the real TechniqueStatus value) to the coverage and
  threat-actor layers specifically — the only two backed by an actual
  TechniqueStatus concept; detection-rules/campaign scores don't
  correspond to one and don't get this field.

backend/app/services/heatmap_service.py

@@ -353,6 +353,17 @@ def build_coverage_layer(
         layer["techniques"].append({
             # Literal argument value
             "techniqueID": tech.mitre_id,
+            # Technique display name — not part of the official ATT&CK
+            # Navigator schema, but harmless extra data for Navigator
+            # imports and lets Aegis's own heatmap UI show names inline
+            # instead of only ID + hover tooltip.
+            "name": tech.name,
+            # Only the coverage layer has a real TechniqueStatus concept —
+            # exposed so the frontend can color cells by the exact same
+            # discrete status palette the Techniques page uses, instead of
+            # a continuous score-derived hex. The other 3 layer types don't
+            # set this (their score doesn't correspond to a TechniqueStatus).
+            "status": tech.status_global.value,
             # Literal argument value
             "tactic": _format_tactic(tech.tactic),
             # Literal argument value
@@ -491,6 +502,11 @@ def build_threat_actor_layer(
             )
         layer["techniques"].append({
             "techniqueID": tech.mitre_id,
+            "name": tech.name,
+            # Every appended row here is an actor-used technique (non-actor
+            # ones are skipped above), so status_global is meaningful here
+            # too — see the coverage layer's "status" field for why.
+            "status": tech.status_global.value,
             "tactic": _format_tactic(tech.tactic),
             "color": _score_to_color(score),
             "score": score,
@@ -586,6 +602,7 @@ def build_detection_rules_layer(
         layer["techniques"].append({
             # Literal argument value
             "techniqueID": tech.mitre_id,
+            "name": tech.name,
             # Literal argument value
             "tactic": _format_tactic(tech.tactic),
             # Literal argument value
@@ -754,6 +771,7 @@ def build_campaign_layer(
         layer["techniques"].append({
             # Literal argument value
             "techniqueID": mitre_id,
+            "name": tech.name,
             # Literal argument value
             "tactic": _format_tactic(tech.tactic),
             # Literal argument value