Wire the composition root: flags, providers, runnables, manifests, samples, docs

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

CHANGELOG.md

@@ -1 +1,14 @@
 # Changelog
+
+## 2026-08-09 17:27 CEST — Operator wired end to end: reconciler, health, leases, discovery, GC, two providers
+
+- `cmd/main.go` is now the full composition root: `--providers-config` (required, fail-fast),
+  `--discovery-addr`, `--proxy-namespace`, `--health-workers`, `--gc-interval`, `--gc-min-age`,
+  `--gc-allow-namespaced`, `--lease-cooldown`, `--max-lease-ttl`; wires the kubernetes + gcp
+  providers (metrics-instrumented), health engine, lease store, discovery API, orphan GC, and
+  Prometheus metrics onto one manager.
+- Deploy manifests: providers ConfigMap mount, optional `DISCOVERY_TOKEN` Secret env,
+  discovery port 8090 + Service; pods RBAC for the kubernetes provider.
+- Samples for all three proxy flavors + providers-config; `make run-dev` for local development.
+- README rewritten (kind quickstart, GCP setup, the two load-bearing caveats); architecture doc
+  completed with components table and the full decision log.