Restore published plugin version history

Affected packages returned server errors from the versions endpoint, leaving plugin details unavailable in the Control UI.

Filters release visibility before a single native Convex pagination call, preserving the 1–200 item target, scan limits, legacy releases, native cursor continuation and split metadata. Direct queries and HTTP clients share the corrected owner.

• Restores access to published version history while pending, blocked, and deleted releases remain hidden.
• Preserves pagination and legacy releases without schema changes, new writers, or a new cache.
• Repairs the shared backend path rather than masking the error in an individual client.

• The PR links real Convex HTTP/browser testing with synthetic data: baseline HTTP 500 became 200, continuation recovered published and legacy versions, and a 250-item request returned 200 items followed by two remaining releases.
• The PR reports 836 targeted and 6,700 unit tests plus coverage. GitHub unit, static, type/build, HTTP E2E, browser and CodeQL checks passed.
• The Vercel deployment check failed; merge and test evidence do not establish production deployment. The verified merge commit credits Goutam Adwant.