feat(swarm): add swarm self-improvement loop infrastructure

Adds complete k8s manifests, ArgoCD app, and Terraform namespace
resources for the Neuron swarm self-improvement loop system.

Each variant (alpha, beta, gamma) gets its own isolated namespace,
PVC, MCP/REST deployments, ExternalSecrets from Vault, RBAC for CI,
and a SQLite clone Job template for session startup.

servers/legion/k8s/neuron-technologies/swarm/externalsecrets.yaml

@@ -0,0 +1,155 @@
+# Swarm variants share the same secrets as prod.
+# Each variant gets its own ExternalSecret object pointing at the same Vault paths.
+---
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: swarm-alpha-secrets
+  namespace: swarm-alpha
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault
+    kind: ClusterSecretStore
+  target:
+    name: swarm-alpha-secrets
+    creationPolicy: Owner
+  data:
+    - secretKey: NEURON_API_KEY
+      remoteRef:
+        key: secret/data/neuron-technologies/prod
+        property: api_key
+    - secretKey: NEURON_WEBHOOK_SECRET
+      remoteRef:
+        key: secret/data/neuron-technologies/prod
+        property: gitea_webhook_secret
+    - secretKey: NEURON_LICENSE_ADMIN_TOKEN
+      remoteRef:
+        key: secret/data/neuron-technologies/license
+        property: admin_token
+    - secretKey: UNKEY_ROOT_KEY
+      remoteRef:
+        key: secret/data/neuron-technologies/unkey
+        property: root_key
+    - secretKey: UNKEY_API_ID
+      remoteRef:
+        key: secret/data/neuron-technologies/unkey
+        property: api_id
+    - secretKey: NEURON_R2_ENDPOINT
+      remoteRef:
+        key: secret/data/r2
+        property: endpoint
+    - secretKey: NEURON_R2_ACCESS_KEY
+      remoteRef:
+        key: secret/data/r2
+        property: access_key_id
+    - secretKey: NEURON_R2_SECRET_KEY
+      remoteRef:
+        key: secret/data/r2
+        property: secret_access_key
+    - secretKey: NEURON_R2_BUCKET
+      remoteRef:
+        key: secret/data/r2
+        property: neuron_bucket
+---
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: swarm-beta-secrets
+  namespace: swarm-beta
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault
+    kind: ClusterSecretStore
+  target:
+    name: swarm-beta-secrets
+    creationPolicy: Owner
+  data:
+    - secretKey: NEURON_API_KEY
+      remoteRef:
+        key: secret/data/neuron-technologies/prod
+        property: api_key
+    - secretKey: NEURON_WEBHOOK_SECRET
+      remoteRef:
+        key: secret/data/neuron-technologies/prod
+        property: gitea_webhook_secret
+    - secretKey: NEURON_LICENSE_ADMIN_TOKEN
+      remoteRef:
+        key: secret/data/neuron-technologies/license
+        property: admin_token
+    - secretKey: UNKEY_ROOT_KEY
+      remoteRef:
+        key: secret/data/neuron-technologies/unkey
+        property: root_key
+    - secretKey: UNKEY_API_ID
+      remoteRef:
+        key: secret/data/neuron-technologies/unkey
+        property: api_id
+    - secretKey: NEURON_R2_ENDPOINT
+      remoteRef:
+        key: secret/data/r2
+        property: endpoint
+    - secretKey: NEURON_R2_ACCESS_KEY
+      remoteRef:
+        key: secret/data/r2
+        property: access_key_id
+    - secretKey: NEURON_R2_SECRET_KEY
+      remoteRef:
+        key: secret/data/r2
+        property: secret_access_key
+    - secretKey: NEURON_R2_BUCKET
+      remoteRef:
+        key: secret/data/r2
+        property: neuron_bucket
+---
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: swarm-gamma-secrets
+  namespace: swarm-gamma
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault
+    kind: ClusterSecretStore
+  target:
+    name: swarm-gamma-secrets
+    creationPolicy: Owner
+  data:
+    - secretKey: NEURON_API_KEY
+      remoteRef:
+        key: secret/data/neuron-technologies/prod
+        property: api_key
+    - secretKey: NEURON_WEBHOOK_SECRET
+      remoteRef:
+        key: secret/data/neuron-technologies/prod
+        property: gitea_webhook_secret
+    - secretKey: NEURON_LICENSE_ADMIN_TOKEN
+      remoteRef:
+        key: secret/data/neuron-technologies/license
+        property: admin_token
+    - secretKey: UNKEY_ROOT_KEY
+      remoteRef:
+        key: secret/data/neuron-technologies/unkey
+        property: root_key
+    - secretKey: UNKEY_API_ID
+      remoteRef:
+        key: secret/data/neuron-technologies/unkey
+        property: api_id
+    - secretKey: NEURON_R2_ENDPOINT
+      remoteRef:
+        key: secret/data/r2
+        property: endpoint
+    - secretKey: NEURON_R2_ACCESS_KEY
+      remoteRef:
+        key: secret/data/r2
+        property: access_key_id
+    - secretKey: NEURON_R2_SECRET_KEY
+      remoteRef:
+        key: secret/data/r2
+        property: secret_access_key
+    - secretKey: NEURON_R2_BUCKET
+      remoteRef:
+        key: secret/data/r2
+        property: neuron_bucket