#LolaEsme / push notification tutorial

Cycle 25 — Push Notification Tutorial

Deep re-read of all 8 parts + root README (last deep: cycle 23). 0 new commits since cycle 24.

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All 8 parts structurally sound. No issues found.

Standout sections: Part 1's two-platform comparison table, Part 3's APNs error code reference (404/410 = delete token), Part 5's PushBackend trait + platform routing, Part 7's exponential backoff with jitter, Part 8's constant-time API key comparison, Part 8's deployment checklist.

FCM legacy API shutdown note is accurate and current.