feat(local): kind extraMounts + Dory docker for hostPath spike

[patrickleet]

Summary

Spike for [[specs/local-workbench/proposals/kind-dory-hostpath-named-clusters]] (experimental): kind on Dory’s docker engine with $HOME extraMounts so hostPath delivery can pass the node probe on Mac.

• build_kind_config injects kind extraMounts for $HOME
• Auto DOCKER_HOST=unix://$HOME/.dory/dory.sock when unset and sock exists (toward --docker-provider dory)
• Registry hostPort 30501 when product dory-k8s is present (avoids 30500 clash; LWB-REQ-254 seed)
• Post-create docker exec … test -d $HOME verification

Live evidence (this machine)

hops local reset --backend kind
# kind docker engine: DOCKER_HOST=unix://…/dory.sock
# kind registry hostPort=30501
# Creating kind cluster 'hops' with extraMounts /Users/… → /Users/…
# kind node sees host mount path /Users/…
MOUNT_OK
docker inspect: /Users/patrickleet -> /Users/patrickleet

Test plan

• cargo test --bin hops-cli kind:: (9 tests)
• Live recreate on Dory + mount probe
• Follow-up: full hops local up hostPath selection + UI HMR dogfood
• Follow-up: --cp/--dp CLI (still --backend kind this PR)
• Follow-up: named clusters + workspace→cluster registry

Stack

Base: fix/workbench-preserve-shared-identity-ns (stacked workbench series).

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