Drop the Avalanche-heritage /ext prefix; /v1 is the single canonical route
surface (one way, no backward compat). The node's baseURL is the source of
truth; clients, SDKs, CLI, indexer, maker, genesis, netrunner, and the
k8s/compose/gateway/explorer configs are updated to match.
Co-authored-by: Hanzo Dev <dev@hanzo.ai>
Update prose descriptions in README and LLM.md to use "chain" or "L2"
instead of "subnet". Preserves API endpoint paths, JSON field names,
CLI subcommand names, genesis config keys, Go struct fields, and
deprecatedFlagsSupport.json backward compatibility mappings.