hzhang 70b0ccb7d2 feat(kb): wire kb-block fade into before_prompt_build ...

The previous commit shipped renderFaded + tick + seed on Block but
left them dead code because openclaw's `before_prompt_build` hook
ctx doesn't carry a currentTurn signal — the hook called plain
render() and turnFor() returned 0, so add() always stamped
last_refresh_at_turn=0 and fade distance never moved.

This adds a small per-session turn tracker (tools/turn-tracker.ts)
that the hook bumps each fire. On the first bump after plugin start
the counter is seeded from max(entry.last_refresh_at_turn) on the
loaded block, so a restart doesn't regress accumulated fade for
surviving entries. dynamic-kb-cache now reads currentTurnForSession
via the same counter so a fact cached on turn N reads back at d=0
on turn N+1.

The hook now: bumps turn, ticks (drop entries past the m% threshold,
log + save when anything drops), and renderFaded() into
appendSystemContext. Same algorithm as the Plexum-side
RenderDynamicSubblock path.

KBDeps.turnFor signature changed from (agentId) → (sessionId) since
turn is session-scoped — fixed the one cache-tool call site.

Verified end-to-end with a standalone smoke replaying the full
hook+tool flow against a temp profile: stale entry (d=201) drops on
turn 1, fresh entry (d=1) survives untouched, restart re-seeds the
counter from the surviving entry's last_refresh.

2026-06-06 01:06:30 +01:00

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