PLATENG-137: Go port of bonfire_lib — ephemeral namespace and cluster reservation lifecycle

[ritmun]

Summary

This PR is Phase 1 of a 4-phase effort to port bonfire from Python to Go, removing the Python runtime and `oc` binary dependencies.

• Phase 1 (this PR) — `go/pkg/ephemeral`: Go library replacing `bonfire_lib` — namespace and cluster reservation lifecycle via `client-go`, no `oc` or Python required
• Phase 2 — `go/pkg/mcp` + `cmd/bonfire-mcp`: Go MCP server binary replacing `bonfire_mcp`, single static binary with no runtime deps
• Phase 3 — `cmd/bonfire`: CLI namespace/cluster commands (reserve, release, extend, describe, pool list) without `oc`
• Phase 4 — Full deploy pipeline: OpenShift Template processing via `openshift/library-go` (native, no `oc process`), qontract GraphQL client, `bonfire deploy` end-to-end

Full roadmap with checklist: `go/AGENTS.md`.

What's in scope (Phase 1)

• `k8s_client.go` — `EphemeralK8sClient` with DynamicClient + CoreV1 ops, 3 auth modes (token / in-cluster / kubeconfig)
• `reservations.go` — `Reserve`, `Release`, `Extend`
• `clusters.go` — `ReserveCluster`, `ReleaseCluster`, `ExtendCluster`, `GetClusterStatus`, `GetKubeconfig`
• `pools.go` — `ListPools`, `ListClusterPools`, `GetPoolCapacity`
• `status.go` — `GetReservation`, `ListReservations`, `WaitOnReservation`, `DescribeNamespace`
• `config.go`, `utils.go` — settings and shared utilities
• `client_iface.go` — `Client` interface enabling cluster-free unit tests
• 67 table-driven unit tests, no live cluster required

Test plan

• `cd go && go build ./...` passes
• `cd go && go test ./pkg/ephemeral/... -v` — all 67 tests pass
• Manual smoke test against a real cluster (namespace reserve/release cycle)

🤖 Generated with Claude Code

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