## Summary

Adds experimental Node.js 24 and 26 task runtimes through the
`experimental-node-24` and `experimental-node-26` config values.

Existing runtime defaults and the `node`, `node-22`, and `bun` behavior
remain unchanged. The unprefixed `node-24` and `node-26` config values
remain unavailable until the runtimes are ready for general use.

## Design

Experimental config values normalize to canonical runtime identifiers
before build manifests are created, keeping deployment metadata and
execution behavior consistent. Kubernetes task pods also use the
runtime-default seccomp profile so modern Node.js versions fall back
from io_uring to checkpoint-compatible system calls.