feat(inference): add Dynamo admin plane

[samsja]

Summary

• add DynamoAdminPlane as a specialization of the static AdminPlane introduced by chore(inference): introduce admin plane abstraction #3472
• discover Dynamo workers and pin a stable topology before constructing worker admin connections
• encapsulate Dynamo rank-offset calculation, topology validation, collective-RPC payloads, retries, and failure behavior in the client
• override the unified weight-update operation only for NCCL; filesystem and NIXL delegate to the default admin-plane route
• select the Dynamo plane through a factory that is introduced only when the second implementation exists

This is a stacked follow-up to #3472 and incorporates the Dynamo behavior from #3469. InferenceClient remains responsible for data-plane requests; generic weight receivers call one typed AdminPlane.update_weights operation and contain no Dynamo flags or worker metadata.

Validation

• uv run ruff check packages/prime-rl-configs/src/prime_rl/configs/rl.py packages/prime-rl-configs/src/prime_rl/configs/shared.py src/prime_rl/evals/evals.py src/prime_rl/inference/dynamo.py src/prime_rl/orchestrator/clients.py src/prime_rl/orchestrator/orchestrator.py tests/unit/inference/test_dynamo.py tests/unit/test_configs.py
• uv run python -m compileall -q src/prime_rl/inference/dynamo.py src/prime_rl/orchestrator/clients.py src/prime_rl/orchestrator/orchestrator.py src/prime_rl/evals/evals.py
• focused Dynamo, admin-plane, and configuration tests (35 passed)

The complete tests/unit/test_configs.py suite additionally requires taskset plugins that are not installed in this worktree (scaleswe, reverse-text, and others).

[samsja]

can we do if else here I dont like like this