HYPERFLEET-1437 - feat: Build the named transport registry and store construction

[kuudori]

Summary

• Introduces a named transport registry (internal/transportregistry) that builds configured transport clients and backing stores at startup, with lifecycle management via Close().
• Adds desireclient (internal/desireclient), a transportclient.TransportClient implementation that writes apply/delete desires and reads mirrored status through the hyperfleet-applier desire store contract.
• Extends deployment config with transports and stores sections (memory/Redis stores; kubernetes and remote transport types), validated at load time. Deployments without transports keep the existing Maestro-first / Kubernetes fallback behavior.
• Wires adapter serve and dry-run through transportregistry.Build / BuildRecording, resolving the legacy executor compatibility key (kubernetes or maestro) from the registry.

Details

Transport registry (internal/transportregistry)

• Build() constructs named transports from config.transports and shared stores from config.stores.
• Legacy path: when transports is unset, builds a single Maestro client (if configured) or Kubernetes client under the historical registry keys.
• Named path: supports kubernetes (direct cluster client) and remote (desire-backed client bound to a named store).
• Stores: memory (in-process) and redis (URL-validated, ping-checked, closed on shutdown).
• BuildRecording() registers dry-run clients under configured transport names without opening network connections.

Desire transport client (internal/desireclient)

• Implements apply, get, discover, and delete against desire.SpecStore.
• Creates paired read desires for apply operations; surfaces ErrNotSyncedYet when mirrored content is not yet available.
• Uses TransportContext (ManagementCluster, Resource) for desire identity and partitioning.

Config & wiring

• New YAML fields on adapter deployment config: transports, stores (template updated in configs/adapter-config-template.yaml).
• transportclient.Registry provides explicit name-based lookup (Get(name)); no routing or fallback inside the registry.
• main.go delegates client construction to the registry and closes owned resources on shutdown.

Stacked work

This branch includes HYPERFLEET-1436 (desireclient foundation) plus HYPERFLEET-1437 (registry construction and integration). Also carries recent main-branch dependency/Konflux updates.

Test plan

• make lint
• make test
• make test-integration (if Docker/Podman available)
• adapter serve with legacy config (no transports) - confirm Maestro/Kubernetes behavior unchanged
• adapter serve with named transports + stores (memory Redis) - confirm startup and registry construction
• adapter serve --dry-run-event event.json - confirm BuildRecording path works
• Remote transport: apply/get/discover/delete against a desire store (manual or integration)

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