#118661's note only fired on the stored-prompt restore path, which a long-lived agent (classic
CLI, TUI, Desktop) runs once per conversation: those surfaces never saw a mid-conversation skill
change. The check now runs from build_turn_context every turn against the prompt the turn
actually sends.
- What was told is kept on the agent for its prompt; a fresh agent (gateway, -q --resume) reads
the newest note back from the WHOLE transcript instead of the last 200 rows, so a long session
no longer re-announces an unchanged delta (review by @kvnloo).
- A compaction rebuild that now lists the announced skills stays quiet.
- Index rows split on ": ", so qualified plugin skills (plugin:skill) parse.
- The plugin go-live note drops its own skills list: the per-turn note covers plugin skills like
any other, so a plugin install no longer announces its skills twice.
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