fix(github): accept cache freshness for event polls

[f0rr0]

Summary

• accept GitHub cache freshness as the Events retry interval when a 304 response omits X-Poll-Interval
• keep explicit malformed poll headers fail-closed
• cover the exact production 304 response shape and timing bound

Production evidence

• retained pg_net history contained 62 Events responses with HTTP 503 versus 10 successes
• the real conditional request reproduced 304 with Cache-Control max-age=300 and no X-Poll-Interval
• the patched collector handles the same live response as a healthy no-op with a 300-second retry

Validation

• bun test: 240 passed
• bun run typecheck
• bun run lint
• bun run format:check
• bunx next build

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Project	Deployment	Actions	Updated (UTC)
f0rr0-github-io	Ready	Preview	Aug 31, 2026 7:41am