Cleanups to release notes

[bdraco]

• Retitled Arduino section from "Breaking Change" to "Major Architectural Change"
• Completely rewrote Arduino as IDF Component section with conversational explanation of bloat problem
• Added 20-30KB RAM savings and 8KB web server savings for Arduino builds
• Added development benefits: faster fixes, ESP-IDF 5.4 access, reduced maintenance
• Added build time trade-off section: Arduino slower, ESP-IDF 2-3x faster
• Added "Should You Migrate to ESP-IDF?" recommendation section
• Changed "Custom component developers" to "External component developers"
• Expanded Security Enhancements intro with security audit results (no privilege escalation, hardening opportunities)
• Rewrote SHA256 OTA section with transition timeline and MD5 rejection date (2026.1.0)
• Added OTA handshake timeout improvement for poor WiFi
• Rewrote API Password Deprecation section with clear migration timeline
• Added Dashboard Improvements section with WebSocket updates and instant logs
• Created comprehensive Device Onboarding Improvements section
• Added Captive Portal for ESP-IDF subsection with DNS server details
• Added Improv BLE performance improvements (26x faster, 1KB flash savings, passive scanning)
• Connected Device Onboarding to Made for ESPHome program requirements
• Rewrote Memory & Performance Optimizations intro explaining ~3KB RAM savings context
• Added USB Host FreeRTOS task improvement for high-frequency transfers
• Created "For Contributors" section with CI improvements (large PRs 1h→20min, releases 12h+→1h40m)
• Added Z-Wave proxy link to Home Assistant ZWA-2 adapter with note it could support other hardware

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