fix(sessions): recover failed resumed Session writes before model calls - #4630
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This pull request fixes #4615 by retaining failed resumed Session appends and reconciling them before further model calls, without rerunning completed tools.
Invalidate stale compaction caches after failed or cancelled appends while preserving configured retrieval-window behavior. Keep full-history reads confined to replacement rollback and recovery.
Recovery requires the original backend and exclusive history access. Handoff/terminal recovery and distributed exactly-once execution remain outside this fix.