K8s manifest hardening + new bluejay-infra-lint test project

Manifest hardening (per documented memories):
- apps/asterisk/deployment.yaml: dnsPolicy: None + explicit dnsConfig
  with ndots:2 to prevent CoreDNS *.iamworkin.lan template from
  hijacking external egress (downloads.asterisk.org).
- apps/fc-llm-bridge/fc-llm-bridge.yaml: same dnsConfig pattern for
  api.anthropic.com egress.
- apps/fc-ttsreader/fc-ttsreader.yaml: same dnsConfig pattern for
  huggingface.co model seeding.
- apps/fc-messageboard/fc-messageboard.yaml: tcpSocket probes
  (replacing httpGet /health) per "Probes against /health 404 when
  app has global auth middleware".
- apps/fc-signalcontrol/fc-signalcontrol.yaml: same tcpSocket probe
  fix.

New lint project:
- tests/bluejay-infra-lint/BluejayInfraLint.Tests.csproj — local-first
  lint test sweep for the recurring K8s gotchas in the fleet.
- tests/bluejay-infra-lint/FleetManifestLintTests.cs — 7 lint tests
  covering tcpSocket probes, dnsConfig presence on egress-heavy pods,
  IngressRoute/Service namespace alignment, image pull policy, etc.
- tests/bluejay-infra-lint/conftest.dev/ — matching conftest policies
  for environments with conftest/opa.
- .gitignore — adds bin/ + obj/ + DS_Store/swp.

README.md adds a "Local manifest lint" section with the canonical
test command, plus 4 new gotcha entries (IngressRoute namespace
split, public read-only host method allowlists, Traefik VIP netpol
backend ports, auth-safe probes).

Tests: 7 / 7 lint tests passed.

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

tests/bluejay-infra-lint/conftest.dev/07_public_egress_dns_none.rego

@@ -0,0 +1,27 @@
+package bluejayinfra.public_egress_dns_none
+
+public_egress_workloads := {
+  "asterisk",
+  "fc-llm-bridge",
+  "mysql-web",
+  "php-web",
+  "ttsreader-align",
+  "ttsreader-kokoro",
+  "ttsreader-modern",
+  "ttsreader-piper",
+}
+
+deny[msg] {
+  input.kind == "Deployment"
+  public_egress_workloads[input.metadata.name]
+  object.get(input.spec.template.spec, "dnsPolicy", "") != "None"
+  msg := sprintf("Deployment %s/%s must set dnsPolicy: None for public-internet egress", [input.metadata.namespace, input.metadata.name])
+}
+
+deny[msg] {
+  input.kind == "Deployment"
+  public_egress_workloads[input.metadata.name]
+  search := object.get(object.get(input.spec.template.spec, "dnsConfig", {}), "searches", [])[_]
+  contains(lower(search), "iamworkin.lan")
+  msg := sprintf("Deployment %s/%s must not include iamworkin.lan in dnsConfig.searches", [input.metadata.namespace, input.metadata.name])
+}