Optimize catalog filter membership checks

[emilus512-cmyk]

Summary

This PR reduces repeated array membership scans in the agent and plugin catalog filters by converting the per-item lookups to Sets before evaluating selected filters.

Why

The catalog filter paths were repeatedly doing includes() against arrays for each item in the list. On larger catalogs, that turns filter evaluation into a quadratic-style cost for each render.

Changes

• Use Set-based membership checks in AgentsCatalog
• Use Set-based membership checks in PluginsCatalog

Validation

• Ran the website data generation build pipeline successfully
• Verified the Astro site build succeeds after generating the JSON metadata

[github-actions]

🚦 Submission status: 👀 Ready for review

Risk tier: merge-risk:medium — New or substantially changed resource without privileged execution
Required to merge: passing submission-gate checks plus 1 approval from reviewers with write access.

Why this tier

• Changes 73 lines (low-risk limit is 40)

Automated checks

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Review

• Approvals: 0/1
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Commands

Command	Who	What it does
/rerun-checks	PR author, maintainers	Re-runs failed or incomplete checks and re-evaluates this gate
/request-review	PR author, maintainers	Asks the review rotation to assign a reviewer (adds needs-reviewer)

_{Updated for 9849554 · gate run · This comment is maintained automatically — see submission gate docs.}

[aaronpowell]

/rerun-checks

[github-actions]

🔁 /rerun-checks for 9849554

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