Fix agent client generation

[decko]

Summary

This PR builds on #202, which now provides isolated per-agent generator copies. It adds the remaining client-generation and agent-startup fixes:

• use the current gen-client.sh interface
• forward API-version and wait for API readiness
• preserve transactional agent creation with traversable 755 permissions
• generate pulpcore bindings before plugin bindings when needed

Generator compatibility

The previous implementation invoked pulp-openapi-generator/generate.sh, which performed project normalization (pulpcore -> core, pulp_rpm -> rpm) before invoking gen-client.sh.

The checked-out generate.sh explicitly prints DEPRECATED: use ./gen-client.sh instead. This PR invokes gen-client.sh directly. The project-to-component normalization remains in the oci-env adapter because gen-client.sh accepts a component name, not a Pulp project name. Older generator checkouts without gen-client.sh now fail with an actionable update message.

Validation

• fresh agent created and started with the pulp-2367 pulpcore worktree
• API status returned 200
• pulpcore client generation and import succeeded
• python3 -m compileall -q client/oci_env
• bash -n base/local_scripts/generate_client.sh
• git diff --check
• RPM functional smoke test: 4 passed, 1 skipped

Assisted-by: OpenAI GPT-5.6