v0.5.0 — EverOS 1.1.0 alignment

EverOS 1.1.0 alignment. All plugin changes are version-tolerant and safe on EverOS 1.0.x (features light up once the server is on 1.1.0).

Added

• /epk reflect (admin) — trigger EverOS's reflect_episodes strategy to consolidate fragmented episodes / fight over-granularity; soft-archives originals (recoverable). Needs EverOS ≥ 1.1.0; otherwise a friendly 'needs ≥1.1.0' hint.
• log_archive_success (default on) — INFO logs on successful add/flush, so you can eyeball that memory was stored.

Changed

• EverOS client is now 1.1.0-aware — parses the typed error.code envelope, distinguishes retryable (503 EXTERNAL_SERVICE_UNAVAILABLE / transport timeout) from permanent errors, and does bounded retry (everos_retry_retryable, default 1). EverOS errors now log a graded WARNING instead of an ERROR stack. Fully backward-compatible with EverOS 1.0.x.

See CHANGELOG.md for details.