Update agent config: address review feedback from recent PRs

[kelos-bot]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Updates agent configuration based on review feedback from recent PRs:

1. Add KELOS_UPSTREAM_REPO to CI check commands (kelos-pr-responder)

   • Motivated by: cubic review on PR Update agent config: address review feedback from recent PRs #748 — gh pr checks can target the wrong repo in upstream/fork workflows without --repo "$KELOS_UPSTREAM_REPO"

2. Require make verify and make test in re-review loops (kelos-pr-responder, kelos-workers)

   • Motivated by: cubic review on PR Add convention: search before deleting or renaming files #742 — re-review loops allowed commit/push after changes without rerunning verification, bypassing the pre-push verification requirement

3. Add Kubernetes resource.Quantity comparison convention (AGENTS.md, agentconfig.yaml)

   • Motivated by: PR Add spawner container resource requirements flags #737 review — reflect.DeepEqual misdetected drift for equivalent resource.Quantity values because the struct has internal fields that differ for semantically identical quantities (e.g., 1000m vs 1 CPU). Adding this as a project convention to prevent recurrence.

Which issue(s) this PR is related to:

N/A

Special notes for your reviewer:

All review feedback has been addressed:

• Removed "API changes require config updates" convention from both agentconfig.yaml and AGENTS.md per reviewer request (to be handled separately)
• Commits squashed into a single commit

Does this PR introduce a user-facing change?

NONE