chore(domain): yourplatform.com → breakpilot.com

Apply the platform-domain decision (2026-05-18) to every manifest,
overlay, DNS template, README, and script in this repo.

Refs: M1.1

README.md

@@ -35,7 +35,7 @@ The single source of truth for which container runs on which VM in which environ
 │   ├── vm-data.toml            m2.medium, private, data plane (scale driver)
 │   └── stage.toml              m2.small, public IP, ephemeral
 ├── dns/
-│   └── yourplatform.com.zone.template   PowerDNS zone — body lands in M0.3
+│   └── breakpilot.com.zone.template   PowerDNS zone — body lands in M0.3
 ├── cluster.toml.tmpl           # Cluster-level config (acme_email, backup, ai); rendered per env
 ├── scripts/
 │   ├── validate.sh             # `make validate`
@@ -100,7 +100,7 @@ Until the milestone PR lands, the stub still parses and `make validate` stays gr
 ## Observability
 
 - Traces, logs, metrics: [SigNoz](https://signoz.meghsakha.com) — service name per individual container
-- On-call: `oncall@yourplatform.com` · runbooks at `platform/docs/runbooks/`
+- On-call: `oncall@breakpilot.com` · runbooks at `platform/docs/runbooks/`
 
 ## Contributing