Muata Kamdibe c0a11c7cf4 fix(memory): harden cursor recovery against non-integer corruption
_next_cursor now checks isinstance(cursor, int) before arithmetic,
falling back to a reverse scan of all entries when the last entry's
cursor is corrupted. read_unprocessed_history skips entries with
non-int cursors instead of crashing on comparison.

Root cause: external callers (cron jobs, plugins) occasionally wrote
string cursors to history.jsonl, which blocked all subsequent
append_history calls with TypeError/ValueError.

Includes 7 regression tests covering string, float, null, and list
cursor types.
2026-04-21 14:02:53 +08:00
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