owners: add RainbowMango as reviewer and approver

[ranxi2001]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This adds @RainbowMango to the root reviewers and approvers, formalizing responsibilities already exercised across AgentCube. As of July 16, 2026, GitHub indexes 23 distinct non-authored AgentCube PRs reviewed by RainbowMango (19 human-authored and four Dependabot PRs); 19 carry an APPROVED review and 18 of those are merged. Deeper reviews include 28 inline comments: 20 original threads and eight follow-up replies. The examples below show the quality behind those numbers:

• Organizes release and proposal work through two authored issues: created [v0.2.0] Call for proposals #386 as the v0.2.0 umbrella for proposal triage, ownership, and merge tracking; it currently records eight completed work items. Framed the long-term boundary between Kubernetes-owned resource pools and AgentCube-owned session lifecycle in [Discussion] Evolving architecture: decouple agent provisioning from the Kubernetes control plane #430 and opened it for community design work.
• Keeps changes focused and requires rationale for exceptions: split PicoD request-body hardening into Limit picod request body size for prevent DoS attack #326; in chore(deps): add dependabot configuration for github-actions #396 requested a predictable schedule and accepted grouping after the author explained the noise-reduction trade-off.
• Across 17 original threads in the ongoing [Proposal] add sandbox-pool management proposal #431 review, challenged API extensibility, field contracts, status-write scaling, and manifest recovery. The author removed NodeSelector and adopted corev1.ResourceList and Lease heartbeat; remaining contract questions stay open.
• Confirmed the multi-architecture build bottleneck against Docker's FROM --platform contract in #419, before ci: build multi-arch images with native Go builder #420 merged the $BUILDPLATFORM fix.

Which issue(s) this PR fixes:

NONE

Special notes for your reviewer:

• Scope/validation: only root OWNERS changes; runtime behavior and APIs are unchanged. The entries are case-insensitively sorted; YAML parsing, ordering, and uniqueness checks pass.
• AI assistance: Codex helped audit the public contribution history; I reviewed the two-line change and this text.

Does this PR introduce a user-facing change?:

NONE

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[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign hzxuzhonghu for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[gemini-code-assist]

Code Review

This pull request updates the OWNERS file to add 'RainbowMango' to both the reviewers and approvers lists. There are no review comments, and I have no feedback to provide.

Important

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.98%. Comparing base (3b19390) to head (63bea7a).
⚠️ Report is 26 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
+ Coverage   58.41%   59.98%   +1.57%     
==========================================
  Files          36       36              
  Lines        3463     3589     +126     
==========================================
+ Hits         2023     2153     +130     
+ Misses       1231     1216      -15     
- Partials      209      220      +11     

Flag	Coverage Δ
unittests	59.98% <ø> (+1.57%)	⬆️

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